How to recover a zfs pool after a root system crash
If your sun solaris server is crashed due to a failed root disk, you will need to recover the solaris OS on your own (simply re-install, of course after you have replaced your failed disk). But if you were so wise to create a zfs pool (in this case the pool is called dozer) on a different set of disks, you are able to recover everything with the following commands:
# zpool import
pool: dozer
id: 2704475622193776801
state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:
dozer ONLINE
c1t9d0 ONLINE
#
As you can see the pool is online and available for import.
# zpool import dozer
cannot import ‘dozer’: pool may be in use on another system
use ‘-f’ to import anyway
#
If you get this error message, it means that the pool was not cleanly exported (logical if you had an OS crash 
) and you will need to force the import of the pool.
# zpool import -f dozer
#
Source : Importing ZFS Storage Pools