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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 | ||
| .gitignore | ||
| libzfs_changelist.c | ||
| libzfs_config.c | ||
| libzfs_crypto.c | ||
| libzfs_dataset.c | ||
| libzfs_diff.c | ||
| libzfs_impl.h | ||
| libzfs_import.c | ||
| libzfs_iter.c | ||
| libzfs_mount.c | ||
| libzfs_pool.c | ||
| libzfs_sendrecv.c | ||
| libzfs_status.c | ||
| libzfs_util.c | ||
| libzfs.abi | ||
| libzfs.pc.in | ||
| libzfs.suppr | ||
| Makefile.am | ||
| THIRDPARTYLICENSE.openssl | ||
| THIRDPARTYLICENSE.openssl.descrip | ||