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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
module/zfs/vdev_removal.c
+27 -15
View File
@@ -250,7 +250,7 @@ vdev_remove_initiate_sync(void *arg, dmu_tx_t *tx)
spa_vdev_removal_t *svr = NULL;
uint64_t txg __maybe_unused = dmu_tx_get_txg(tx);
ASSERT3P(vd->vdev_ops, !=, &vdev_raidz_ops);
ASSERT0(vdev_get_nparity(vd));
svr = spa_vdev_removal_create(vd);
ASSERT(vd->vdev_removing);
@@ -1120,7 +1120,7 @@ static void
vdev_remove_enlist_zaps(vdev_t *vd, nvlist_t *zlist)
{
ASSERT3P(zlist, !=, NULL);
ASSERT3P(vd->vdev_ops, !=, &vdev_raidz_ops);
ASSERT0(vdev_get_nparity(vd));
if (vd->vdev_leaf_zap != 0) {
char zkey[32];
@@ -2041,7 +2041,7 @@ spa_vdev_remove_top_check(vdev_t *vd)
/*
* All vdevs in normal class must have the same ashift
* and not be raidz.
* and not be raidz or draid.
*/
vdev_t *rvd = spa->spa_root_vdev;
int num_indirect = 0;
@@ -2064,7 +2064,7 @@ spa_vdev_remove_top_check(vdev_t *vd)
num_indirect++;
if (!vdev_is_concrete(cvd))
continue;
if (cvd->vdev_ops == &vdev_raidz_ops)
if (vdev_get_nparity(cvd) != 0)
return (SET_ERROR(EINVAL));
/*
* Need the mirror to be mirror of leaf vdevs only
@@ -2217,18 +2217,30 @@ spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
* in this pool.
*/
if (vd == NULL || unspare) {
if (vd == NULL)
vd = spa_lookup_by_guid(spa, guid, B_TRUE);
ev = spa_event_create(spa, vd, NULL,
ESC_ZFS_VDEV_REMOVE_AUX);
char *type;
boolean_t draid_spare = B_FALSE;
vd_type = VDEV_TYPE_SPARE;
vd_path = spa_strdup(fnvlist_lookup_string(
nv, ZPOOL_CONFIG_PATH));
spa_vdev_remove_aux(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, nspares, nv);
spa_load_spares(spa);
spa->spa_spares.sav_sync = B_TRUE;
if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type)
== 0 && strcmp(type, VDEV_TYPE_DRAID_SPARE) == 0)
draid_spare = B_TRUE;
if (vd == NULL && draid_spare) {
error = SET_ERROR(ENOTSUP);
} else {
if (vd == NULL)
vd = spa_lookup_by_guid(spa,
guid, B_TRUE);
ev = spa_event_create(spa, vd, NULL,
ESC_ZFS_VDEV_REMOVE_AUX);
vd_type = VDEV_TYPE_SPARE;
vd_path = spa_strdup(fnvlist_lookup_string(
nv, ZPOOL_CONFIG_PATH));
spa_vdev_remove_aux(spa->spa_spares.sav_config,
ZPOOL_CONFIG_SPARES, spares, nspares, nv);
spa_load_spares(spa);
spa->spa_spares.sav_sync = B_TRUE;
}
} else {
error = SET_ERROR(EBUSY);
}