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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 |
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| .. | ||
| os | ||
| sys | ||
| .gitignore | ||
| cityhash.h | ||
| libnvpair.h | ||
| libuutil_common.h | ||
| libuutil_impl.h | ||
| libuutil.h | ||
| libzdb.h | ||
| libzfs_core.h | ||
| libzfs.h | ||
| libzfsbootenv.h | ||
| libzutil.h | ||
| Makefile.am | ||
| thread_pool.h | ||
| zfeature_common.h | ||
| zfs_comutil.h | ||
| zfs_crrd.h | ||
| zfs_deleg.h | ||
| zfs_fletcher.h | ||
| zfs_namecheck.h | ||
| zfs_prop.h | ||
| zfs_valstr.h | ||