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Detect a slow raidz child during reads

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A single slow responding disk can affect the overall read
performance of a raidz group.  When a raidz child disk is
determined to be a persistent slow outlier, then have it
sit out during reads for a period of time. The raidz group
can use parity to reconstruct the data that was skipped.

Each time a slow disk is placed into a sit out period, its
`vdev_stat.vs_slow_ios count` is incremented and a zevent
class `ereport.fs.zfs.delay` is posted.

The length of the sit out period can be changed using the
`raid_read_sit_out_secs` module parameter.  Setting it to
zero disables slow outlier detection.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Contributions-by: Don Brady <don.brady@klarasystems.com>
Contributions-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17227
This commit is contained in:
Paul Dagnelie
2025-08-27 16:41:48 -07:00
committed by Brian Behlendorf
parent 0620c979a5
commit d64711c202
28 changed files with 1399 additions and 13 deletions
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lib/libzfs/libzfs.abi
+3 -1
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@@ -6117,7 +6117,9 @@
<enumerator name='VDEV_PROP_TRIM_SUPPORT' value='49'/>
<enumerator name='VDEV_PROP_TRIM_ERRORS' value='50'/>
<enumerator name='VDEV_PROP_SLOW_IOS' value='51'/>
<enumerator name='VDEV_NUM_PROPS' value='52'/>
<enumerator name='VDEV_PROP_SIT_OUT' value='52'/>
<enumerator name='VDEV_PROP_AUTOSIT' value='53'/>
<enumerator name='VDEV_NUM_PROPS' value='54'/>
</enum-decl>
<typedef-decl name='vdev_prop_t' type-id='1573bec8' id='5aa5c90c'/>
<class-decl name='zpool_load_policy' size-in-bits='256' is-struct='yes' visibility='default' id='2f65b36f'>