Article for Message ID:   ZFS-8000-4J

Corrupted device label in a replicated configuration






A device could not be opened due to a missing or invalid device label.

Automated Response

A hot spare will be activated if available.


The pool is no longer providing the configured level of replication.

Suggested Action for System Administrator

For an active pool

If this error was encountered while running 'zpool import', please see the section below. Otherwise, run 'zpool status -x' to determine which pool has experienced a failure:

# zpool status -x
  pool: test
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
 scrub: none requested

        NAME                  STATE     READ WRITE CKSUM
        test                  DEGRADED     0     0     0
          mirror              DEGRADED     0     0     0
            c0t0d0            ONLINE       0     0     0
            c0t0d1            FAULTED      0     0     0  corrupted data

errors: No known data errors

If the device has been temporarily detached from the system, attach the device to the system and run 'zpool status' again. The pool should automatically detect the newly attached device and resume functioning.

If the device is no longer available, it can be replaced using 'zpool replace':

# zpool replace test c0t0d1 c0t0d2

If the device has been replaced by another disk in the same physical slot, then the device can be replaced using a single argument to the 'zpool replace' command:

# zpool replace test c0t0d1

ZFS will begin migrating data to the new device as soon as the replace is issued. Once the resilvering completes, the original device (if different from the replacement) will be removed, and the pool will be restored to the ONLINE state.

For an exported pool

If this error is encountered while running 'zpool import', the pool can be still be imported despite the failure:

# zpool import
  pool: test
    id: 5187963178597328409
 state: DEGRADED
status: One or more devices contains corrupted data.  The fault tolerance of
	the pool may be compromised if imported.
action: The pool can be imported using its name or numeric identifier.

        test              DEGRADED
          mirror          DEGRADED
            c0t0d0        ONLINE
            c0t0d1        FAULTED   corrupted data

To import the pool, run 'zpool import':

# zpool import test

Once the pool has been imported, the damaged device can be replaced according to the above procedure.


The Message ID: ZFS-8000-4J indicates a device which was unable to be opened by the ZFS subsystem.