Commits on May 25, 2024

1. zed: Add deadman-slot_off.sh zedlet …

   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.
   
   Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

   

   behlendorf committed May 25, 2024
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