Resolving a Removed Device
If a device is completely removed from the system, ZFS detects that the device
cannot be opened and places it in the REMOVED
state.
Depending on the data replication level of the pool, this removal might or might
not result in the entire pool becoming unavailable. If one disk in a mirrored or
RAID-Z device is removed, the pool continues to be accessible. A pool might
become UNAVAIL
, which means no data is accessible until the
device is reattached, under the following conditions:
If a redundant storage pool device is accidentally removed and reinserted, then you can just clear the device error, in most cases. For example:
$ zpool clear system1 c1t1d0