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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
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| .. | ||
| acl | ||
| alloc_class | ||
| arc | ||
| atime | ||
| bootfs | ||
| btree | ||
| cache | ||
| cachefile | ||
| casenorm | ||
| channel_program | ||
| chattr | ||
| checksum | ||
| clean_mirror | ||
| cli_root | ||
| cli_user | ||
| compression | ||
| cp_files | ||
| ctime | ||
| deadman | ||
| delegate | ||
| devices | ||
| events | ||
| exec | ||
| fallocate | ||
| fault | ||
| features | ||
| grow | ||
| history | ||
| hkdf | ||
| inheritance | ||
| inuse | ||
| io | ||
| l2arc | ||
| large_files | ||
| largest_pool | ||
| libzfs | ||
| limits | ||
| link_count | ||
| log_spacemap | ||
| migration | ||
| mmap | ||
| mmp | ||
| mount | ||
| mv_files | ||
| nestedfs | ||
| no_space | ||
| nopwrite | ||
| online_offline | ||
| pam | ||
| pool_checkpoint | ||
| pool_names | ||
| poolversion | ||
| privilege | ||
| procfs | ||
| projectquota | ||
| pyzfs | ||
| quota | ||
| raidz | ||
| redacted_send | ||
| redundancy | ||
| refquota | ||
| refreserv | ||
| removal | ||
| rename_dirs | ||
| replacement | ||
| reservation | ||
| rootpool | ||
| rsend | ||
| scrub_mirror | ||
| slog | ||
| snapshot | ||
| snapused | ||
| sparse | ||
| suid | ||
| threadsappend | ||
| tmpfile | ||
| trim | ||
| truncate | ||
| upgrade | ||
| user_namespace | ||
| userquota | ||
| vdev_zaps | ||
| write_dirs | ||
| xattr | ||
| zpool_influxdb | ||
| zvol | ||
| Makefile.am | ||