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Distributed Spare (dRAID) Feature

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This patch adds a new top-level vdev type called dRAID, which stands
for Distributed parity RAID.  This pool configuration allows all dRAID
vdevs to participate when rebuilding to a distributed hot spare device.
This can substantially reduce the total time required to restore full
parity to pool with a failed device.

A dRAID pool can be created using the new top-level `draid` type.
Like `raidz`, the desired redundancy is specified after the type:
`draid[1,2,3]`.  No additional information is required to create the
pool and reasonable default values will be chosen based on the number
of child vdevs in the dRAID vdev.

    zpool create <pool> draid[1,2,3] <vdevs...>

Unlike raidz, additional optional dRAID configuration values can be
provided as part of the draid type as colon separated values. This
allows administrators to fully specify a layout for either performance
or capacity reasons.  The supported options include:

    zpool create <pool> \
        draid[<parity>][:<data>d][:<children>c][:<spares>s] \
        <vdevs...>

    - draid[parity]       - Parity level (default 1)
    - draid[:<data>d]     - Data devices per group (default 8)
    - draid[:<children>c] - Expected number of child vdevs
    - draid[:<spares>s]   - Distributed hot spares (default 0)

Abbreviated example `zpool status` output for a 68 disk dRAID pool
with two distributed spares using special allocation classes.

```
  pool: tank
 state: ONLINE
config:

    NAME                  STATE     READ WRITE CKSUM
    slag7                 ONLINE       0     0     0
      draid2:8d:68c:2s-0  ONLINE       0     0     0
        L0                ONLINE       0     0     0
        L1                ONLINE       0     0     0
        ...
        U25               ONLINE       0     0     0
        U26               ONLINE       0     0     0
        spare-53          ONLINE       0     0     0
          U27             ONLINE       0     0     0
          draid2-0-0      ONLINE       0     0     0
        U28               ONLINE       0     0     0
        U29               ONLINE       0     0     0
        ...
        U42               ONLINE       0     0     0
        U43               ONLINE       0     0     0
    special
      mirror-1            ONLINE       0     0     0
        L5                ONLINE       0     0     0
        U5                ONLINE       0     0     0
      mirror-2            ONLINE       0     0     0
        L6                ONLINE       0     0     0
        U6                ONLINE       0     0     0
    spares
      draid2-0-0          INUSE     currently in use
      draid2-0-1          AVAIL
```

When adding test coverage for the new dRAID vdev type the following
options were added to the ztest command.  These options are leverages
by zloop.sh to test a wide range of dRAID configurations.

    -K draid|raidz|random - kind of RAID to test
    -D <value>            - dRAID data drives per group
    -S <value>            - dRAID distributed hot spares
    -R <value>            - RAID parity (raidz or dRAID)

The zpool_create, zpool_import, redundancy, replacement and fault
test groups have all been updated provide test coverage for the
dRAID feature.

Co-authored-by: Isaac Huang <he.huang@intel.com>
Co-authored-by: Mark Maybee <mmaybee@cray.com>
Co-authored-by: Don Brady <don.brady@delphix.com>
Co-authored-by: Matthew Ahrens <mahrens@delphix.com>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Mark Maybee <mmaybee@cray.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #10102
This commit is contained in:
Brian Behlendorf
2020-11-13 13:51:51 -08:00
committed by GitHub
parent a724db0374
commit b2255edcc0
153 changed files with 10203 additions and 1882 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/zed/agents/zfs_mod.c
+9 -1
View File
@@ -435,7 +435,15 @@ zfs_process_add(zpool_handle_t *zhp, nvlist_t *vdev, boolean_t labeled)
return;
}
ret = zpool_vdev_attach(zhp, fullpath, path, nvroot, B_TRUE, B_FALSE);
/*
* Prefer sequential resilvering when supported (mirrors and dRAID),
* otherwise fallback to a traditional healing resilver.
*/
ret = zpool_vdev_attach(zhp, fullpath, path, nvroot, B_TRUE, B_TRUE);
if (ret != 0) {
ret = zpool_vdev_attach(zhp, fullpath, path, nvroot,
B_TRUE, B_FALSE);
}
zed_log_msg(LOG_INFO, " zpool_vdev_replace: %s with %s (%s)",
fullpath, path, (ret == 0) ? "no errors" :
cmd/zed/agents/zfs_retire.c
+9 -2
View File
@@ -219,12 +219,18 @@ replace_with_spare(fmd_hdl_t *hdl, zpool_handle_t *zhp, nvlist_t *vdev)
* replace it.
*/
for (s = 0; s < nspares; s++) {
char *spare_name;
boolean_t rebuild = B_FALSE;
char *spare_name, *type;
if (nvlist_lookup_string(spares[s], ZPOOL_CONFIG_PATH,
&spare_name) != 0)
continue;
/* prefer sequential resilvering for distributed spares */
if ((nvlist_lookup_string(spares[s], ZPOOL_CONFIG_TYPE,
&type) == 0) && strcmp(type, VDEV_TYPE_DRAID_SPARE) == 0)
rebuild = B_TRUE;
/* if set, add the "ashift" pool property to the spare nvlist */
if (source != ZPROP_SRC_DEFAULT)
(void) nvlist_add_uint64(spares[s],
@@ -237,7 +243,7 @@ replace_with_spare(fmd_hdl_t *hdl, zpool_handle_t *zhp, nvlist_t *vdev)
dev_name, basename(spare_name));
if (zpool_vdev_attach(zhp, dev_name, spare_name,
replacement, B_TRUE, B_FALSE) == 0) {
replacement, B_TRUE, rebuild) == 0) {
free(dev_name);
nvlist_free(replacement);
return (B_TRUE);
@@ -499,6 +505,7 @@ zfs_retire_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl,
* Attempt to substitute a hot spare.
*/
(void) replace_with_spare(hdl, zhp, vdev);
zpool_close(zhp);
}