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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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module/zcommon/zpool_prop.c
+6
View File
@@ -467,9 +467,15 @@ vdev_prop_init(void)
zprop_register_index(VDEV_PROP_RAIDZ_EXPANDING, "raidz_expanding", 0,
PROP_READONLY, ZFS_TYPE_VDEV, "on | off", "RAIDZ_EXPANDING",
boolean_table, sfeatures);
zprop_register_index(VDEV_PROP_SIT_OUT, "sit_out", 0,
PROP_DEFAULT, ZFS_TYPE_VDEV, "on | off", "SIT_OUT", boolean_table,
sfeatures);
zprop_register_index(VDEV_PROP_TRIM_SUPPORT, "trim_support", 0,
PROP_READONLY, ZFS_TYPE_VDEV, "on | off", "TRIMSUP",
boolean_table, sfeatures);
zprop_register_index(VDEV_PROP_AUTOSIT, "autosit", 0,
PROP_DEFAULT, ZFS_TYPE_VDEV, "on | off", "AUTOSIT", boolean_table,
sfeatures);
/* default index properties */
zprop_register_index(VDEV_PROP_FAILFAST, "failfast", B_TRUE,