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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 0df85ec27c
commit df55ba7c49
28 changed files with 1399 additions and 13 deletions
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include/sys/vdev_raidz.h
+3
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@@ -61,6 +61,9 @@ void vdev_raidz_checksum_error(zio_t *, struct raidz_col *, abd_t *);
struct raidz_row *vdev_raidz_row_alloc(int, zio_t *);
void vdev_raidz_reflow_copy_scratch(spa_t *);
void raidz_dtl_reassessed(vdev_t *);
boolean_t vdev_sit_out_reads(vdev_t *, zio_flag_t);
void vdev_raidz_sit_child(vdev_t *, uint64_t);
void vdev_raidz_unsit_child(vdev_t *);
extern const zio_vsd_ops_t vdev_raidz_vsd_ops;