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Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
*/
#include <sys/abd.h>
#include <sys/mmp.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
Emit an error message before MMP suspends pool In mmp_thread(), emit an MMP specific error message before calling zio_suspend() so that the administrator will understand why the pool is being suspended. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: John L. Hammond <john.hammond@intel.com> Closes #7048
2018-01-17 23:24:42 +03:00
#include <sys/time.h>
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
#include <sys/vdev.h>
#include <sys/vdev_impl.h>
#include <sys/zfs_context.h>
#include <sys/callb.h>
/*
* Multi-Modifier Protection (MMP) attempts to prevent a user from importing
* or opening a pool on more than one host at a time. In particular, it
* prevents "zpool import -f" on a host from succeeding while the pool is
* already imported on another host. There are many other ways in which a
* device could be used by two hosts for different purposes at the same time
* resulting in pool damage. This implementation does not attempt to detect
* those cases.
*
* MMP operates by ensuring there are frequent visible changes on disk (a
* "heartbeat") at all times. And by altering the import process to check
* for these changes and failing the import when they are detected. This
* functionality is enabled by setting the 'multihost' pool property to on.
*
* Uberblocks written by the txg_sync thread always go into the first
* (N-MMP_BLOCKS_PER_LABEL) slots, the remaining slots are reserved for MMP.
* They are used to hold uberblocks which are exactly the same as the last
* synced uberblock except that the ub_timestamp is frequently updated.
* Like all other uberblocks, the slot is written with an embedded checksum,
* and slots with invalid checksums are ignored. This provides the
* "heartbeat", with no risk of overwriting good uberblocks that must be
* preserved, e.g. previous txgs and associated block pointers.
*
* Two optional fields are added to uberblock structure: ub_mmp_magic and
* ub_mmp_delay. The magic field allows zfs to tell whether ub_mmp_delay is
* valid. The delay field is a decaying average of the amount of time between
* completion of successive MMP writes, in nanoseconds. It is used to predict
* how long the import must wait to detect activity in the pool, before
* concluding it is not in use.
*
* During import an activity test may now be performed to determine if
* the pool is in use. The activity test is typically required if the
* ZPOOL_CONFIG_HOSTID does not match the system hostid, the pool state is
* POOL_STATE_ACTIVE, and the pool is not a root pool.
*
* The activity test finds the "best" uberblock (highest txg & timestamp),
* waits some time, and then finds the "best" uberblock again. If the txg
* and timestamp in both "best" uberblocks do not match, the pool is in use
* by another host and the import fails. Since the granularity of the
* timestamp is in seconds this activity test must take a bare minimum of one
* second. In order to assure the accuracy of the activity test, the default
* values result in an activity test duration of 10x the mmp write interval.
*
* The "zpool import" activity test can be expected to take a minimum time of
* zfs_multihost_import_intervals * zfs_multihost_interval milliseconds. If the
* "best" uberblock has a valid ub_mmp_delay field, then the duration of the
* test may take longer if MMP writes were occurring less frequently than
* expected. Additionally, the duration is then extended by a random 25% to
* attempt to to detect simultaneous imports. For example, if both partner
* hosts are rebooted at the same time and automatically attempt to import the
* pool.
*/
/*
* Used to control the frequency of mmp writes which are performed when the
* 'multihost' pool property is on. This is one factor used to determine the
* length of the activity check during import.
*
* The mmp write period is zfs_multihost_interval / leaf-vdevs milliseconds.
* This means that on average an mmp write will be issued for each leaf vdev
* every zfs_multihost_interval milliseconds. In practice, the observed period
* can vary with the I/O load and this observed value is the delay which is
* stored in the uberblock. The minimum allowed value is 100 ms.
*/
ulong_t zfs_multihost_interval = MMP_DEFAULT_INTERVAL;
/*
* Used to control the duration of the activity test on import. Smaller values
* of zfs_multihost_import_intervals will reduce the import time but increase
* the risk of failing to detect an active pool. The total activity check time
* is never allowed to drop below one second. A value of 0 is ignored and
* treated as if it was set to 1.
*/
uint_t zfs_multihost_import_intervals = MMP_DEFAULT_IMPORT_INTERVALS;
/*
* Controls the behavior of the pool when mmp write failures are detected.
*
* When zfs_multihost_fail_intervals = 0 then mmp write failures are ignored.
* The failures will still be reported to the ZED which depending on its
* configuration may take action such as suspending the pool or taking a
* device offline.
*
* When zfs_multihost_fail_intervals > 0 then sequential mmp write failures will
* cause the pool to be suspended. This occurs when
* zfs_multihost_fail_intervals * zfs_multihost_interval milliseconds have
* passed since the last successful mmp write. This guarantees the activity
* test will see mmp writes if the
* pool is imported.
*/
uint_t zfs_multihost_fail_intervals = MMP_DEFAULT_FAIL_INTERVALS;
mmp should use a fixed tag for spa_config locks mmp_write_uberblock() and mmp_write_done() should the same tag for spa_config_locks. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Sanjeev Bagewadi <sanjeev.bagewadi@gmail.com> Closes #6530 Closes #7155
2018-02-12 22:30:38 +03:00
char *mmp_tag = "mmp_write_uberblock";
Simplify threads, mutexs, cvs and rwlocks * Simplify threads, mutexs, cvs and rwlocks * Update the zk_thread_create() function to use the same trick as Illumos. Specifically, cast the new pthread_t to a void pointer and return that as the kthread_t *. This avoids the issues associated with managing a wrapper structure and is safe as long as the callers never attempt to dereference it. * Update all function prototypes passed to pthread_create() to match the expected prototype. We were getting away this with before since the function were explicitly cast. * Replaced direct zk_thread_create() calls with thread_create() for code consistency. All consumers of libzpool now use the proper wrappers. * The mutex_held() calls were converted to MUTEX_HELD(). * Removed all mutex_owner() calls and retired the interface. Instead use MUTEX_HELD() which provides the same information and allows the implementation details to be hidden. In this case the use of the pthread_equals() function. * The kthread_t, kmutex_t, krwlock_t, and krwlock_t types had any non essential fields removed. In the case of kthread_t and kcondvar_t they could be directly typedef'd to pthread_t and pthread_cond_t respectively. * Removed all extra ASSERTS from the thread, mutex, rwlock, and cv wrapper functions. In practice, pthreads already provides the vast majority of checks as long as we check the return code. Removing this code from our wrappers help readability. * Added TS_JOINABLE state flag to pass to request a joinable rather than detached thread. This isn't a standard thread_create() state but it's the least invasive way to pass this information and is only used by ztest. TEST_ZTEST_TIMEOUT=3600 Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Tom Caputi <tcaputi@datto.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4547 Closes #5503 Closes #5523 Closes #6377 Closes #6495
2017-08-11 18:51:44 +03:00
static void mmp_thread(void *arg);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
void
mmp_init(spa_t *spa)
{
mmp_thread_t *mmp = &spa->spa_mmp;
mutex_init(&mmp->mmp_thread_lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&mmp->mmp_thread_cv, NULL, CV_DEFAULT, NULL);
mutex_init(&mmp->mmp_io_lock, NULL, MUTEX_DEFAULT, NULL);
Report duration and error in mmp_history entries After an MMP write completes, update the relevant mmp_history entry with the time between submission and completion, and the error status of the write. [faaland1@toss3a zfs]$ cat /proc/spl/kstat/zfs/pool/multihost 39 0 0x01 100 8800 69147946270893 72723903122926 id txg timestamp error duration mmp_delay vdev_guid 10607 1166 1518985089 0 138301 637785455 4882... 10608 1166 1518985089 0 136154 635407747 1151... 10609 1166 1518985089 0 803618560 633048078 9740... 10610 1166 1518985090 0 144826 633048078 4882... 10611 1166 1518985090 0 164527 666187671 1151... Where duration = gethrtime_in_done_fn - gethrtime_at_submission, and error = zio->io_error. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7190
2018-02-23 02:34:34 +03:00
mmp->mmp_kstat_id = 1;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
}
void
mmp_fini(spa_t *spa)
{
mmp_thread_t *mmp = &spa->spa_mmp;
mutex_destroy(&mmp->mmp_thread_lock);
cv_destroy(&mmp->mmp_thread_cv);
mutex_destroy(&mmp->mmp_io_lock);
}
static void
mmp_thread_enter(mmp_thread_t *mmp, callb_cpr_t *cpr)
{
CALLB_CPR_INIT(cpr, &mmp->mmp_thread_lock, callb_generic_cpr, FTAG);
mutex_enter(&mmp->mmp_thread_lock);
}
static void
mmp_thread_exit(mmp_thread_t *mmp, kthread_t **mpp, callb_cpr_t *cpr)
{
ASSERT(*mpp != NULL);
*mpp = NULL;
cv_broadcast(&mmp->mmp_thread_cv);
CALLB_CPR_EXIT(cpr); /* drops &mmp->mmp_thread_lock */
thread_exit();
}
void
mmp_thread_start(spa_t *spa)
{
mmp_thread_t *mmp = &spa->spa_mmp;
if (spa_writeable(spa)) {
mutex_enter(&mmp->mmp_thread_lock);
if (!mmp->mmp_thread) {
dprintf("mmp_thread_start pool %s\n",
spa->spa_name);
mmp->mmp_thread = thread_create(NULL, 0, mmp_thread,
spa, 0, &p0, TS_RUN, defclsyspri);
}
mutex_exit(&mmp->mmp_thread_lock);
}
}
void
mmp_thread_stop(spa_t *spa)
{
mmp_thread_t *mmp = &spa->spa_mmp;
mutex_enter(&mmp->mmp_thread_lock);
mmp->mmp_thread_exiting = 1;
cv_broadcast(&mmp->mmp_thread_cv);
while (mmp->mmp_thread) {
cv_wait(&mmp->mmp_thread_cv, &mmp->mmp_thread_lock);
}
mutex_exit(&mmp->mmp_thread_lock);
ASSERT(mmp->mmp_thread == NULL);
mmp->mmp_thread_exiting = 0;
}
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
typedef enum mmp_vdev_state_flag {
MMP_FAIL_NOT_WRITABLE = (1 << 0),
MMP_FAIL_WRITE_PENDING = (1 << 1),
} mmp_vdev_state_flag_t;
/*
* Find a leaf vdev to write an MMP block to. It must not have an outstanding
* mmp write (if so a new write will also likely block). If there is no usable
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
* leaf, a nonzero error value is returned. The error value returned is a bit
* field.
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
*
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
* MMP_FAIL_WRITE_PENDING One or more leaf vdevs are writeable, but have an
* outstanding MMP write.
* MMP_FAIL_NOT_WRITABLE One or more leaf vdevs are not writeable.
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
*/
static int
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
mmp_next_leaf(spa_t *spa)
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
{
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
vdev_t *leaf;
vdev_t *starting_leaf;
int fail_mask = 0;
ASSERT(MUTEX_HELD(&spa->spa_mmp.mmp_io_lock));
ASSERT(spa_config_held(spa, SCL_STATE, RW_READER));
ASSERT(list_link_active(&spa->spa_leaf_list.list_head) == B_TRUE);
ASSERT(!list_is_empty(&spa->spa_leaf_list));
if (spa->spa_mmp.mmp_leaf_last_gen != spa->spa_leaf_list_gen) {
spa->spa_mmp.mmp_last_leaf = list_head(&spa->spa_leaf_list);
spa->spa_mmp.mmp_leaf_last_gen = spa->spa_leaf_list_gen;
}
leaf = spa->spa_mmp.mmp_last_leaf;
if (leaf == NULL)
leaf = list_head(&spa->spa_leaf_list);
starting_leaf = leaf;
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
do {
leaf = list_next(&spa->spa_leaf_list, leaf);
if (leaf == NULL)
leaf = list_head(&spa->spa_leaf_list);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
if (!vdev_writeable(leaf)) {
fail_mask |= MMP_FAIL_NOT_WRITABLE;
} else if (leaf->vdev_mmp_pending != 0) {
fail_mask |= MMP_FAIL_WRITE_PENDING;
} else {
spa->spa_mmp.mmp_last_leaf = leaf;
return (0);
}
} while (leaf != starting_leaf);
ASSERT(fail_mask);
return (fail_mask);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
}
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
/*
* MMP writes are issued on a fixed schedule, but may complete at variable,
* much longer, intervals. The mmp_delay captures long periods between
* successful writes for any reason, including disk latency, scheduling delays,
* etc.
*
* The mmp_delay is usually calculated as a decaying average, but if the latest
* delay is higher we do not average it, so that we do not hide sudden spikes
* which the importing host must wait for.
*
* If writes are occurring frequently, such as due to a high rate of txg syncs,
* the mmp_delay could become very small. Since those short delays depend on
* activity we cannot count on, we never allow mmp_delay to get lower than rate
* expected if only mmp_thread writes occur.
*
* If an mmp write was skipped or fails, and we have already waited longer than
* mmp_delay, we need to update it so the next write reflects the longer delay.
*
* Do not set mmp_delay if the multihost property is not on, so as not to
* trigger an activity check on import.
*/
static void
mmp_delay_update(spa_t *spa, boolean_t write_completed)
{
mmp_thread_t *mts = &spa->spa_mmp;
hrtime_t delay = gethrtime() - mts->mmp_last_write;
ASSERT(MUTEX_HELD(&mts->mmp_io_lock));
if (spa_multihost(spa) == B_FALSE) {
mts->mmp_delay = 0;
return;
}
if (delay > mts->mmp_delay)
mts->mmp_delay = delay;
if (write_completed == B_FALSE)
return;
mts->mmp_last_write = gethrtime();
/*
* strictly less than, in case delay was changed above.
*/
if (delay < mts->mmp_delay) {
hrtime_t min_delay = MSEC2NSEC(zfs_multihost_interval) /
Fix divide-by-zero in mmp_delay_update() vdev_count_leaves() in the denominator may return 0, caught by Coverity. Introduced by * 533ea04 Update mmp_delay on sync or skipped, failed write Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7391
2018-04-06 23:29:11 +03:00
MAX(1, vdev_count_leaves(spa));
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
mts->mmp_delay = MAX(((delay + mts->mmp_delay * 127) / 128),
min_delay);
}
}
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
static void
mmp_write_done(zio_t *zio)
{
spa_t *spa = zio->io_spa;
vdev_t *vd = zio->io_vd;
mmp_thread_t *mts = zio->io_private;
mutex_enter(&mts->mmp_io_lock);
Report duration and error in mmp_history entries After an MMP write completes, update the relevant mmp_history entry with the time between submission and completion, and the error status of the write. [faaland1@toss3a zfs]$ cat /proc/spl/kstat/zfs/pool/multihost 39 0 0x01 100 8800 69147946270893 72723903122926 id txg timestamp error duration mmp_delay vdev_guid 10607 1166 1518985089 0 138301 637785455 4882... 10608 1166 1518985089 0 136154 635407747 1151... 10609 1166 1518985089 0 803618560 633048078 9740... 10610 1166 1518985090 0 144826 633048078 4882... 10611 1166 1518985090 0 164527 666187671 1151... Where duration = gethrtime_in_done_fn - gethrtime_at_submission, and error = zio->io_error. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7190
2018-02-23 02:34:34 +03:00
uint64_t mmp_kstat_id = vd->vdev_mmp_kstat_id;
hrtime_t mmp_write_duration = gethrtime() - vd->vdev_mmp_pending;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
mmp_delay_update(spa, (zio->io_error == 0));
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
Report duration and error in mmp_history entries After an MMP write completes, update the relevant mmp_history entry with the time between submission and completion, and the error status of the write. [faaland1@toss3a zfs]$ cat /proc/spl/kstat/zfs/pool/multihost 39 0 0x01 100 8800 69147946270893 72723903122926 id txg timestamp error duration mmp_delay vdev_guid 10607 1166 1518985089 0 138301 637785455 4882... 10608 1166 1518985089 0 136154 635407747 1151... 10609 1166 1518985089 0 803618560 633048078 9740... 10610 1166 1518985090 0 144826 633048078 4882... 10611 1166 1518985090 0 164527 666187671 1151... Where duration = gethrtime_in_done_fn - gethrtime_at_submission, and error = zio->io_error. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7190
2018-02-23 02:34:34 +03:00
vd->vdev_mmp_pending = 0;
vd->vdev_mmp_kstat_id = 0;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mutex_exit(&mts->mmp_io_lock);
mmp should use a fixed tag for spa_config locks mmp_write_uberblock() and mmp_write_done() should the same tag for spa_config_locks. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Sanjeev Bagewadi <sanjeev.bagewadi@gmail.com> Closes #6530 Closes #7155
2018-02-12 22:30:38 +03:00
spa_config_exit(spa, SCL_STATE, mmp_tag);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
Report duration and error in mmp_history entries After an MMP write completes, update the relevant mmp_history entry with the time between submission and completion, and the error status of the write. [faaland1@toss3a zfs]$ cat /proc/spl/kstat/zfs/pool/multihost 39 0 0x01 100 8800 69147946270893 72723903122926 id txg timestamp error duration mmp_delay vdev_guid 10607 1166 1518985089 0 138301 637785455 4882... 10608 1166 1518985089 0 136154 635407747 1151... 10609 1166 1518985089 0 803618560 633048078 9740... 10610 1166 1518985090 0 144826 633048078 4882... 10611 1166 1518985090 0 164527 666187671 1151... Where duration = gethrtime_in_done_fn - gethrtime_at_submission, and error = zio->io_error. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7190
2018-02-23 02:34:34 +03:00
spa_mmp_history_set(spa, mmp_kstat_id, zio->io_error,
mmp_write_duration);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
abd_free(zio->io_abd);
}
/*
* When the uberblock on-disk is updated by a spa_sync,
* creating a new "best" uberblock, update the one stored
* in the mmp thread state, used for mmp writes.
*/
void
mmp_update_uberblock(spa_t *spa, uberblock_t *ub)
{
mmp_thread_t *mmp = &spa->spa_mmp;
mutex_enter(&mmp->mmp_io_lock);
mmp->mmp_ub = *ub;
mmp->mmp_ub.ub_timestamp = gethrestime_sec();
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
mmp_delay_update(spa, B_TRUE);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mutex_exit(&mmp->mmp_io_lock);
}
/*
* Choose a random vdev, label, and MMP block, and write over it
* with a copy of the last-synced uberblock, whose timestamp
* has been updated to reflect that the pool is in use.
*/
static void
mmp_write_uberblock(spa_t *spa)
{
int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
mmp_thread_t *mmp = &spa->spa_mmp;
uberblock_t *ub;
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
vdev_t *vd = NULL;
int label, error;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
uint64_t offset;
Detect long config lock acquisition in mmp If something holds the config lock as a writer for too long, MMP will fail to issue MMP writes in a timely manner. This will result either in the pool being suspended, or in an extreme case, in the pool not being protected. If the time to acquire the config lock exceeds 1/10 of the minimum zfs_multihost_interval, report it in the zfs debug log. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-21 04:33:51 +03:00
hrtime_t lock_acquire_time = gethrtime();
mmp should use a fixed tag for spa_config locks mmp_write_uberblock() and mmp_write_done() should the same tag for spa_config_locks. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Sanjeev Bagewadi <sanjeev.bagewadi@gmail.com> Closes #6530 Closes #7155
2018-02-12 22:30:38 +03:00
spa_config_enter(spa, SCL_STATE, mmp_tag, RW_READER);
Detect long config lock acquisition in mmp If something holds the config lock as a writer for too long, MMP will fail to issue MMP writes in a timely manner. This will result either in the pool being suspended, or in an extreme case, in the pool not being protected. If the time to acquire the config lock exceeds 1/10 of the minimum zfs_multihost_interval, report it in the zfs debug log. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-21 04:33:51 +03:00
lock_acquire_time = gethrtime() - lock_acquire_time;
if (lock_acquire_time > (MSEC2NSEC(MMP_MIN_INTERVAL) / 10))
zfs_dbgmsg("SCL_STATE acquisition took %llu ns\n",
(u_longlong_t)lock_acquire_time);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
mutex_enter(&mmp->mmp_io_lock);
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
error = mmp_next_leaf(spa);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
/*
* spa_mmp_history has two types of entries:
* Issued MMP write: records time issued, error status, etc.
* Skipped MMP write: an MMP write could not be issued because no
* suitable leaf vdev was available. See comment above struct
* spa_mmp_history for details.
*/
if (error) {
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
mmp_delay_update(spa, B_FALSE);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
if (mmp->mmp_skip_error == error) {
spa_mmp_history_set_skip(spa, mmp->mmp_kstat_id - 1);
} else {
mmp->mmp_skip_error = error;
spa_mmp_history_add(spa, mmp->mmp_ub.ub_txg,
gethrestime_sec(), mmp->mmp_delay, NULL, 0,
mmp->mmp_kstat_id++, error);
}
mutex_exit(&mmp->mmp_io_lock);
Use proper tag for spa config refcounts in mmp_write_uberblock() This allows the spa config refcounts to use tracking in debug builds without triggering the "No such hold %p on refcount" panic. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #8326
2019-01-25 20:50:06 +03:00
spa_config_exit(spa, SCL_STATE, mmp_tag);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
return;
Release SCL_STATE in map_write_done() The config lock must be held for the duration of the MMP write. Since the I/Os are executed via map_nowait(), the done function is the only place where we know the write has completed. Since SCL_STATE is taken as reader, overlapping I/Os do not create a deadlock. The refcount is simply increased when new I/Os are queued and decreased when I/Os complete. Test case added which exercises the probe IO call path to verify the fix and prevent a regression. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6394
2017-07-24 18:48:28 +03:00
}
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
MMP writes rotate over leaves Instead of choosing a leaf vdev quasi-randomly, by starting at the root vdev and randomly choosing children, rotate over leaves to issue MMP writes. This fixes an issue in a pool whose top-level vdevs have different numbers of leaves. The issue is that the frequency at which individual leaves are chosen for MMP writes is based not on the total number of leaves but based on how many siblings the leaves have. For example, in a pool like this: root-vdev +------+---------------+ vdev1 vdev2 | | | +------+-----+-----+----+ disk1 disk2 disk3 disk4 disk5 disk6 vdev1 and vdev2 will each be chosen 50% of the time. Every time vdev1 is chosen, disk1 will be chosen. However, every time vdev2 is chosen, disk2 is chosen 20% of the time. As a result, disk1 will be sent 5x as many MMP writes as disk2. This may create wear issues in the case of SSDs. It also reduces the effectiveness of MMP as it depends on the writes being evenly distributed for the case where some devices fail or are partitioned. The new code maintains a list of leaf vdevs in the pool. MMP records the last leaf used for an MMP write in mmp->mmp_last_leaf. To choose the next leaf, MMP starts at mmp->mmp_last_leaf and traverses the list, continuing from the head if the tail is reached. It stops when a suitable leaf is found or all leaves have been examined. Added a test to verify MMP write distribution is even. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7953
2019-03-12 20:37:06 +03:00
vd = spa->spa_mmp.mmp_last_leaf;
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
mmp->mmp_skip_error = 0;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
if (mmp->mmp_zio_root == NULL)
mmp->mmp_zio_root = zio_root(spa, NULL, NULL,
flags | ZIO_FLAG_GODFATHER);
ub = &mmp->mmp_ub;
ub->ub_timestamp = gethrestime_sec();
ub->ub_mmp_magic = MMP_MAGIC;
ub->ub_mmp_delay = mmp->mmp_delay;
vd->vdev_mmp_pending = gethrtime();
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
vd->vdev_mmp_kstat_id = mmp->mmp_kstat_id;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
zio_t *zio = zio_null(mmp->mmp_zio_root, spa, NULL, NULL, NULL, flags);
abd_t *ub_abd = abd_alloc_for_io(VDEV_UBERBLOCK_SIZE(vd), B_TRUE);
abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd));
abd_copy_from_buf(ub_abd, ub, sizeof (uberblock_t));
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
mmp->mmp_kstat_id++;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mutex_exit(&mmp->mmp_io_lock);
offset = VDEV_UBERBLOCK_OFFSET(vd, VDEV_UBERBLOCK_COUNT(vd) -
MMP_BLOCKS_PER_LABEL + spa_get_random(MMP_BLOCKS_PER_LABEL));
label = spa_get_random(VDEV_LABELS);
vdev_label_write(zio, vd, label, ub_abd, offset,
VDEV_UBERBLOCK_SIZE(vd), mmp_write_done, mmp,
flags | ZIO_FLAG_DONT_PROPAGATE);
Record skipped MMP writes in multihost_history Once per pass through the MMP thread's loop, the vdev tree is walked to find a suitable leaf to write the next MMP block to. If no such leaf is found, the thread sleeps for a while and resumes at the top of the loop. Add an entry to multihost_history when no leaf can be found, and record the reason in the error column. The error code for such entries is a bitfield, displayed in hex: 0x1 At least one vdev (interior or leaf) was not writeable. 0x2 At least one writeable leaf vdev was found, but it had a pending MMP write. timestamp = the time in seconds since the epoch when no leaf could be found originally. duration = the time (in ns) during which no MMP block was written for this reason. This does not include the preceeding inter-write period nor the following inter-write period. vdev_guid = the number of sequential cycles of the MMP thread looop when this occurred. Sample output, truncated to fit: For records of skipped MMP writes the right-most column, vdev_path, is reported as "-". id txg timestamp error duration mmp_delay vdev_guid ... 936 11 1520036441 0 146264 891422313 1740883117838 ... 937 11 1520036441 0 163956 888356657 7320395061548 ... 938 11 1520036442 0 130690 885314969 7320395061548 ... 939 11 1520036442 0 2001068577 882296582 1740883117838 ... 940 11 1520036443 0 161806 882296582 7320395061548 ... 941 11 1520036443 0x2 0 998020546 1 ... 942 11 1520036444 0 136585 998020546 7320395061548 ... 943 11 1520036444 0x2 0 998020257 1 ... 944 11 1520036445 5 2002662964 994160219 1740883117838 ... 945 11 1520036445 0x2 998073118 994160219 3 ... 946 11 1520036447 0 247136 994160219 7320395061548 ... Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
2018-02-27 04:32:49 +03:00
(void) spa_mmp_history_add(spa, ub->ub_txg, ub->ub_timestamp,
ub->ub_mmp_delay, vd, label, vd->vdev_mmp_kstat_id, 0);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
zio_nowait(zio);
}
static void
Simplify threads, mutexs, cvs and rwlocks * Simplify threads, mutexs, cvs and rwlocks * Update the zk_thread_create() function to use the same trick as Illumos. Specifically, cast the new pthread_t to a void pointer and return that as the kthread_t *. This avoids the issues associated with managing a wrapper structure and is safe as long as the callers never attempt to dereference it. * Update all function prototypes passed to pthread_create() to match the expected prototype. We were getting away this with before since the function were explicitly cast. * Replaced direct zk_thread_create() calls with thread_create() for code consistency. All consumers of libzpool now use the proper wrappers. * The mutex_held() calls were converted to MUTEX_HELD(). * Removed all mutex_owner() calls and retired the interface. Instead use MUTEX_HELD() which provides the same information and allows the implementation details to be hidden. In this case the use of the pthread_equals() function. * The kthread_t, kmutex_t, krwlock_t, and krwlock_t types had any non essential fields removed. In the case of kthread_t and kcondvar_t they could be directly typedef'd to pthread_t and pthread_cond_t respectively. * Removed all extra ASSERTS from the thread, mutex, rwlock, and cv wrapper functions. In practice, pthreads already provides the vast majority of checks as long as we check the return code. Removing this code from our wrappers help readability. * Added TS_JOINABLE state flag to pass to request a joinable rather than detached thread. This isn't a standard thread_create() state but it's the least invasive way to pass this information and is only used by ztest. TEST_ZTEST_TIMEOUT=3600 Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Tom Caputi <tcaputi@datto.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4547 Closes #5503 Closes #5523 Closes #6377 Closes #6495
2017-08-11 18:51:44 +03:00
mmp_thread(void *arg)
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
{
Simplify threads, mutexs, cvs and rwlocks * Simplify threads, mutexs, cvs and rwlocks * Update the zk_thread_create() function to use the same trick as Illumos. Specifically, cast the new pthread_t to a void pointer and return that as the kthread_t *. This avoids the issues associated with managing a wrapper structure and is safe as long as the callers never attempt to dereference it. * Update all function prototypes passed to pthread_create() to match the expected prototype. We were getting away this with before since the function were explicitly cast. * Replaced direct zk_thread_create() calls with thread_create() for code consistency. All consumers of libzpool now use the proper wrappers. * The mutex_held() calls were converted to MUTEX_HELD(). * Removed all mutex_owner() calls and retired the interface. Instead use MUTEX_HELD() which provides the same information and allows the implementation details to be hidden. In this case the use of the pthread_equals() function. * The kthread_t, kmutex_t, krwlock_t, and krwlock_t types had any non essential fields removed. In the case of kthread_t and kcondvar_t they could be directly typedef'd to pthread_t and pthread_cond_t respectively. * Removed all extra ASSERTS from the thread, mutex, rwlock, and cv wrapper functions. In practice, pthreads already provides the vast majority of checks as long as we check the return code. Removing this code from our wrappers help readability. * Added TS_JOINABLE state flag to pass to request a joinable rather than detached thread. This isn't a standard thread_create() state but it's the least invasive way to pass this information and is only used by ztest. TEST_ZTEST_TIMEOUT=3600 Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Tom Caputi <tcaputi@datto.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4547 Closes #5503 Closes #5523 Closes #6377 Closes #6495
2017-08-11 18:51:44 +03:00
spa_t *spa = (spa_t *)arg;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mmp_thread_t *mmp = &spa->spa_mmp;
boolean_t last_spa_suspended = spa_suspended(spa);
boolean_t last_spa_multihost = spa_multihost(spa);
callb_cpr_t cpr;
hrtime_t max_fail_ns = zfs_multihost_fail_intervals *
MSEC2NSEC(MAX(zfs_multihost_interval, MMP_MIN_INTERVAL));
mmp_thread_enter(mmp, &cpr);
/*
* The mmp_write_done() function calculates mmp_delay based on the
* prior value of mmp_delay and the elapsed time since the last write.
* For the first mmp write, there is no "last write", so we start
* with fake, but reasonable, default non-zero values.
*/
mmp->mmp_delay = MSEC2NSEC(MAX(zfs_multihost_interval,
Fix coverity defects: CID 165755 CID 165755: Division or modulo by zero (DIVIDE_BY_ZERO) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov> Closes #6352
2017-07-24 21:16:58 +03:00
MMP_MIN_INTERVAL)) / MAX(vdev_count_leaves(spa), 1);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mmp->mmp_last_write = gethrtime() - mmp->mmp_delay;
while (!mmp->mmp_thread_exiting) {
uint64_t mmp_fail_intervals = zfs_multihost_fail_intervals;
uint64_t mmp_interval = MSEC2NSEC(
MAX(zfs_multihost_interval, MMP_MIN_INTERVAL));
boolean_t suspended = spa_suspended(spa);
boolean_t multihost = spa_multihost(spa);
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
hrtime_t next_time;
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
if (multihost)
next_time = gethrtime() + mmp_interval /
Fix coverity defects: CID 165755 CID 165755: Division or modulo by zero (DIVIDE_BY_ZERO) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov> Closes #6352
2017-07-24 21:16:58 +03:00
MAX(vdev_count_leaves(spa), 1);
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
else
next_time = gethrtime() +
MSEC2NSEC(MMP_DEFAULT_INTERVAL);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
/*
Handle zio_resume and mmp => off When multihost is disabled on a pool, and the pool is resumed via zpool clear, within a single cycle of the mmp thread's loop (e.g. while it's in the cv_timedwait call), both mmp_last_write and mmp_delay should be updated. The original code mistakenly treated the two cases as if they could not occur at the same time. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7286
2018-03-09 02:21:54 +03:00
* MMP off => on, or suspended => !suspended:
* No writes occurred recently. Update mmp_last_write to give
* us some time to try.
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
*/
if ((!last_spa_multihost && multihost) ||
(last_spa_suspended && !suspended)) {
mutex_enter(&mmp->mmp_io_lock);
mmp->mmp_last_write = gethrtime();
mutex_exit(&mmp->mmp_io_lock);
Handle zio_resume and mmp => off When multihost is disabled on a pool, and the pool is resumed via zpool clear, within a single cycle of the mmp thread's loop (e.g. while it's in the cv_timedwait call), both mmp_last_write and mmp_delay should be updated. The original code mistakenly treated the two cases as if they could not occur at the same time. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7286
2018-03-09 02:21:54 +03:00
}
/*
* MMP on => off:
* mmp_delay == 0 tells importing node to skip activity check.
*/
if (last_spa_multihost && !multihost) {
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mutex_enter(&mmp->mmp_io_lock);
mmp->mmp_delay = 0;
mutex_exit(&mmp->mmp_io_lock);
}
last_spa_multihost = multihost;
last_spa_suspended = suspended;
/*
* Smooth max_fail_ns when its factors are decreased, because
* making (max_fail_ns < mmp_interval) results in the pool being
* immediately suspended before writes can occur at the new
* higher frequency.
*/
if ((mmp_interval * mmp_fail_intervals) < max_fail_ns) {
max_fail_ns = ((31 * max_fail_ns) + (mmp_interval *
mmp_fail_intervals)) / 32;
} else {
max_fail_ns = mmp_interval * mmp_fail_intervals;
}
/*
* Suspend the pool if no MMP write has succeeded in over
* mmp_interval * mmp_fail_intervals nanoseconds.
*/
if (!suspended && mmp_fail_intervals && multihost &&
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
(gethrtime() - mmp->mmp_last_write) > max_fail_ns) {
Emit an error message before MMP suspends pool In mmp_thread(), emit an MMP specific error message before calling zio_suspend() so that the administrator will understand why the pool is being suspended. Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: John L. Hammond <john.hammond@intel.com> Closes #7048
2018-01-17 23:24:42 +03:00
cmn_err(CE_WARN, "MMP writes to pool '%s' have not "
"succeeded in over %llus; suspending pool",
spa_name(spa),
Update mmp_delay on sync or skipped, failed write When an MMP write is skipped, or fails, and time since mts->mmp_last_write is already greater than mts->mmp_delay, increase mts->mmp_delay. The original code only updated mts->mmp_delay when a write succeeded, but this results in the write(s) after delays and failed write(s) reporting an ub_mmp_delay which is too low. Update mmp_last_write and mmp_delay if a txg sync was successful. At least one uberblock was written, thus extending the time we can be sure the pool will not be imported by another host. Do not allow mmp_delay to go below (MSEC2NSEC(zfs_multihost_interval) / vdev_count_leaves()) so that a period of frequent successful MMP writes, e.g. due to frequent txg syncs, does not result in an import activity check so short it is not reliable based on mmp thread writes alone. Remove unnecessary local variable, start. We do not use the start time of the loop iteration. Add a debug message in spa_activity_check() to allow verification of the import_delay value and to prove the activity check occurred. Alter the tests that import pools and attempt to detect an activity check. Calculate the expected duration of spa_activity_check() based on module parameters at the time the import is performed, rather than a fixed time set in mmp.cfg. The fixed time may be wrong. Also, use the default zfs_multihost_interval value so the activity check is longer and easier to recognize. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7330
2018-04-05 02:38:44 +03:00
NSEC2SEC(gethrtime() - mmp->mmp_last_write));
Report pool suspended due to MMP When the pool is suspended, record whether it was due to an I/O error or due to MMP writes failing to succeed within the required time. Change spa_suspended from uint8_t to zio_suspend_reason_t to store the reason. When userspace queries pool status via spa_tryimport(), report the reason the pool was suspended in a new key, ZPOOL_CONFIG_SUSPENDED_REASON. In libzfs, when interpreting the returned config nvlist, report suspension due to MMP with a new pool status enum value, ZPOOL_STATUS_IO_FAILURE_MMP. In status_callback(), which generates and emits the message when 'zpool status' is executed, add a case to print an appropriate message for the new pool status enum value. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7296
2018-03-15 20:56:55 +03:00
zio_suspend(spa, NULL, ZIO_SUSPEND_MMP);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
}
Do not initiate MMP writes while pool is suspended While the pool is suspended on host A, it may be imported on host B. If host A continued to write MMP blocks, it would be blindly overwriting MMP blocks written by host B, and the blocks written by host A would have outdated txg information. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7182
2018-02-22 20:14:46 +03:00
if (multihost && !suspended)
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
mmp_write_uberblock(spa);
CALLB_CPR_SAFE_BEGIN(&cpr);
Fix MMP write frequency for large pools When a single pool contains more vdevs than the CONFIG_HZ for for the kernel the mmp thread will not delay properly. Switch to using cv_timedwait_sig_hires() to handle higher resolution delays. This issue was reported on Arch Linux where HZ defaults to only 100 and this could be fairly easily reproduced with a reasonably large pool. Most distribution kernels set CONFIG_HZ=250 or CONFIG_HZ=1000 and thus are unlikely to be impacted. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7205 Closes #7289
2018-03-12 21:26:05 +03:00
(void) cv_timedwait_sig_hires(&mmp->mmp_thread_cv,
&mmp->mmp_thread_lock, next_time, USEC2NSEC(1),
CALLOUT_FLAG_ABSOLUTE);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
CALLB_CPR_SAFE_END(&cpr, &mmp->mmp_thread_lock);
}
/* Outstanding writes are allowed to complete. */
if (mmp->mmp_zio_root)
zio_wait(mmp->mmp_zio_root);
mmp->mmp_zio_root = NULL;
mmp_thread_exit(mmp, &mmp->mmp_thread, &cpr);
}
Add callback for zfs_multihost_interval Add a callback to wake all running mmp threads when zfs_multihost_interval is changed. This is necessary when the interval is changed from a very large value to a significantly lower one, while pools are imported that have the multihost property enabled. Without this commit, the mmp thread does not wake up and detect the new interval until after it has waited the old multihost interval time. A user monitoring mmp writes via the provided kstat would be led to believe that the changed setting did not work. Added a test in the ZTS under mmp to verify the new functionality is working. Added a test to ztest which starts and stops mmp threads, and calls into the code to signal sleeping mmp threads, to test for deadlocks or similar locking issues. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6387
2017-07-21 03:54:26 +03:00
/*
* Signal the MMP thread to wake it, when it is sleeping on
* its cv. Used when some module parameter has changed and
* we want the thread to know about it.
* Only signal if the pool is active and mmp thread is
* running, otherwise there is no thread to wake.
*/
static void
mmp_signal_thread(spa_t *spa)
{
mmp_thread_t *mmp = &spa->spa_mmp;
mutex_enter(&mmp->mmp_thread_lock);
if (mmp->mmp_thread)
cv_broadcast(&mmp->mmp_thread_cv);
mutex_exit(&mmp->mmp_thread_lock);
}
void
mmp_signal_all_threads(void)
{
spa_t *spa = NULL;
mutex_enter(&spa_namespace_lock);
while ((spa = spa_next(spa))) {
if (spa->spa_state == POOL_STATE_ACTIVE)
mmp_signal_thread(spa);
}
mutex_exit(&spa_namespace_lock);
}
Update build system and packaging Minimal changes required to integrate the SPL sources in to the ZFS repository build infrastructure and packaging. Build system and packaging: * Renamed SPL_* autoconf m4 macros to ZFS_*. * Removed redundant SPL_* autoconf m4 macros. * Updated the RPM spec files to remove SPL package dependency. * The zfs package obsoletes the spl package, and the zfs-kmod package obsoletes the spl-kmod package. * The zfs-kmod-devel* packages were updated to add compatibility symlinks under /usr/src/spl-x.y.z until all dependent packages can be updated. They will be removed in a future release. * Updated copy-builtin script for in-kernel builds. * Updated DKMS package to include the spl.ko. * Updated stale AUTHORS file to include all contributors. * Updated stale COPYRIGHT and included the SPL as an exception. * Renamed README.markdown to README.md * Renamed OPENSOLARIS.LICENSE to LICENSE. * Renamed DISCLAIMER to NOTICE. Required code changes: * Removed redundant HAVE_SPL macro. * Removed _BOOT from nvpairs since it doesn't apply for Linux. * Initial header cleanup (removal of empty headers, refactoring). * Remove SPL repository clone/build from zimport.sh. * Use of DEFINE_RATELIMIT_STATE and DEFINE_SPINLOCK removed due to build issues when forcing C99 compilation. * Replaced legacy ACCESS_ONCE with READ_ONCE. * Include needed headers for `current` and `EXPORT_SYMBOL`. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Olaf Faaland <faaland1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> TEST_ZIMPORT_SKIP="yes" Closes #7556
2018-02-16 04:53:18 +03:00
#if defined(_KERNEL)
Add callback for zfs_multihost_interval Add a callback to wake all running mmp threads when zfs_multihost_interval is changed. This is necessary when the interval is changed from a very large value to a significantly lower one, while pools are imported that have the multihost property enabled. Without this commit, the mmp thread does not wake up and detect the new interval until after it has waited the old multihost interval time. A user monitoring mmp writes via the provided kstat would be led to believe that the changed setting did not work. Added a test in the ZTS under mmp to verify the new functionality is working. Added a test to ztest which starts and stops mmp threads, and calls into the code to signal sleeping mmp threads, to test for deadlocks or similar locking issues. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6387
2017-07-21 03:54:26 +03:00
#include <linux/mod_compat.h>
static int
param_set_multihost_interval(const char *val, zfs_kernel_param_t *kp)
{
int ret;
ret = param_set_ulong(val, kp);
if (ret < 0)
return (ret);
module param callbacks check for initialized spa Callbacks provided for module parameters are executed both after the module is loaded, when a user alters it via sysfs, e.g echo bar > /sys/modules/zfs/parameters/foo as well as when the module is loaded with an argument, e.g. modprobe zfs foo=bar In the latter case, the init functions likely have not run yet, including spa_init() which initializes the namespace lock so it is safe to use. Instead of immediately taking the namespace lock and attemping to iterate over initialized spa structures, check whether spa_mode_global is nonzero. This is set by spa_init() after it has initialized the namespace lock. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tim Chase <tim@chase2k.com> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7496 Closes #7521
2018-05-11 22:46:07 +03:00
if (spa_mode_global != 0)
mmp_signal_all_threads();
Add callback for zfs_multihost_interval Add a callback to wake all running mmp threads when zfs_multihost_interval is changed. This is necessary when the interval is changed from a very large value to a significantly lower one, while pools are imported that have the multihost property enabled. Without this commit, the mmp thread does not wake up and detect the new interval until after it has waited the old multihost interval time. A user monitoring mmp writes via the provided kstat would be led to believe that the changed setting did not work. Added a test in the ZTS under mmp to verify the new functionality is working. Added a test to ztest which starts and stops mmp threads, and calls into the code to signal sleeping mmp threads, to test for deadlocks or similar locking issues. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6387
2017-07-21 03:54:26 +03:00
return (ret);
}
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
/* BEGIN CSTYLED */
module_param(zfs_multihost_fail_intervals, uint, 0644);
MODULE_PARM_DESC(zfs_multihost_fail_intervals,
"Max allowed period without a successful mmp write");
Add callback for zfs_multihost_interval Add a callback to wake all running mmp threads when zfs_multihost_interval is changed. This is necessary when the interval is changed from a very large value to a significantly lower one, while pools are imported that have the multihost property enabled. Without this commit, the mmp thread does not wake up and detect the new interval until after it has waited the old multihost interval time. A user monitoring mmp writes via the provided kstat would be led to believe that the changed setting did not work. Added a test in the ZTS under mmp to verify the new functionality is working. Added a test to ztest which starts and stops mmp threads, and calls into the code to signal sleeping mmp threads, to test for deadlocks or similar locking issues. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6387
2017-07-21 03:54:26 +03:00
module_param_call(zfs_multihost_interval, param_set_multihost_interval,
param_get_ulong, &zfs_multihost_interval, 0644);
Multi-modifier protection (MMP) Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
2017-07-08 06:20:35 +03:00
MODULE_PARM_DESC(zfs_multihost_interval,
"Milliseconds between mmp writes to each leaf");
module_param(zfs_multihost_import_intervals, uint, 0644);
MODULE_PARM_DESC(zfs_multihost_import_intervals,
"Number of zfs_multihost_interval periods to wait for activity");
/* END CSTYLED */
#endif
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