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Optionally turn off disk's enclosure slot if an I/O is hung triggering the deadman. It's possible for outstanding I/O to a misbehaving SCSI disk to neither promptly complete or return an error. This can occur due to retry and recovery actions taken by the SCSI layer, driver, or disk. When it occurs the pool will be unresponsive even though there may be sufficient redundancy configured to proceeded without this single disk. When a hung I/O is detected by the kmods it will be posted as a deadman event. By default an I/O is considered to be hung after 5 minutes. This value can be changed with the zfs_deadman_ziotime_ms module parameter. If ZED_POWER_OFF_ENCLOSURE_SLOT_ON_DEADMAN is set the disk's enclosure slot will be powered off causing the outstanding I/O to fail. The ZED will then handle this like a normal disk failure. By default ZED_POWER_OFF_ENCLOSURE_SLOT_ON_DEADMAN is not set. As part of this change `zfs_deadman_events_per_second` is added to control the ratelimitting of deadman events independantly of delay events. In practice, a single deadman event is sufficient and more aren't particularly useful. Alphabetize the zfs_deadman_* entries in zfs.4. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #16226 |
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README.md
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.