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
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'.
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 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
# 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If the device has been replaced by another disk in the same physical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
# 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
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.
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