|title||Missing device in replicated configuration|
|description||A device in a replicated configuration could not be opened.|
|details||The Message ID: ZFS-8000-2Q indicates a device which was unable to be opened by the ZFS subsystem.|
|impact||The pool is no longer providing the configured level of replication.|
|response||A hot spare will be activated if available.|
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 opened. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Attach the missing device and online it using 'zpool online'. see: http://illumos.org/msg/ZFS-8000-2Q scrub: none requested config: 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 cannot open errors: No known data errors
Determine which device failed to open by looking for a FAULTED device with an additional 'cannot open' message. If this device has been inadvertently removed from the system, attach the device and bring it online with 'zpool online':
# zpool online test c0t0d1
If the device is no longer available, the device can be replaced using the 'zpool replace' command:
# 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If the device has been replaced by another disk in the same physical slot, then the device can be replaced using a single argument to the 'zpool replace' command: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
Existing data will be resilvered to the new device. Once the resilvering completes, the device will be removed from the pool.
For an exported pool
If this error is encountered during a 'zpool import', it means that one of the devices is not attached to the system:
# zpool import pool: test id: 10121266328238932306 state: DEGRADED status: One or more devices are missing from the system. action: The pool can be imported despite missing or damaged devices. The fault tolerance of the pool may be compromised if imported. see: http://illumos.org/msg/ZFS-8000-2Q config: test DEGRADED mirror DEGRADED c0t0d0 ONLINE c0t0d1 FAULTED cannot open
Unlike when the pool is active on the system, the device cannot be replaced while the pool is exported. If the device can be attached to the system, attach the device and run 'zpool import' again.
Alternatively, the pool can be imported as-is, though it will be placed in the DEGRADED state due to a missing device. The device will be marked as UNAVAIL. Once the pool has been imported, the missing device can be replaced as described above.