Message: ZFS-8000-HC

titleZFS pool I/O failures
descriptionThe ZFS pool has experienced currently unrecoverable I/O failures.
severitymajor
typeerror
keysfault.fs.zfs.io_failure_wait
detailsThe Message ID: ZFS-8000-HC indicates that the pool has experienced I/O failures. Take the documented action to resolve the problem.
impactRead and write I/Os cannot be serviced.
responseNo automated response will be taken.
action

The pool has experienced I/O failures. Since the ZFS pool property 'failmode' is set to 'wait', all I/Os (reads and writes) are blocked. See the zpool(1M) manpage for more information on the 'failmode' property. Manual intervention is required for I/Os to be serviced. You can see which devices are affected by running 'zpool status -x': 

# zpool status -x
  pool: test
 state: FAULTED
status: There are I/O failures.
action: Make sure the affected devices are connected, then run 'zpool clear'.
   see: https://zfsonlinux.org/msg/ZFS-8000-HC
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        test        FAULTED      0    13     0  insufficient replicas
          c0t0d0    FAULTED      0     7     0  experienced I/O failures
          c0t1d0    ONLINE       0     0     0

errors: 1 data errors, use '-v' for a list

After you have made sure the affected devices are connected, run 'zpool clear' to allow I/O to the pool again: 

# zpool clear test

If I/O failures continue to happen, then applications and commands for the pool may hang. At this point, a reboot may be necessary to allow I/O to the pool again.