# zpool status
  pool: Export
 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://www.sun.com/msg/ZFS-8000-D3
 scrub: resilver completed with 0 errors on Fri Apr 20 09:49:59 2007
config:

        NAME           STATE     READ WRITE CKSUM
        Export         DEGRADED     0     0     0
          raidz2       ONLINE       0     0     0
            c3t8d0     ONLINE       0     0     0
            c3t9d0     ONLINE       0     0     0
            c3t10d0    ONLINE       0     0     0
            c3t11d0    ONLINE       0     0     0
            c3t12d0    ONLINE       0     0     0
            c3t13d0    ONLINE       0     0     0
            c3t14d0    ONLINE       0     0     0
            c3t15d0    ONLINE       0     0     0
          raidz2       DEGRADED     0     0     0
            c3t16d0    ONLINE       0     0     0
            c3t17d0    ONLINE       0     0     0
            c3t18d0    ONLINE       0     0     0
            c3t19d0    ONLINE       0     0     0
            spare      DEGRADED     0     0     0
              c3t20d0  UNAVAIL     22 11.52     0  cannot open
              c3t23d0  ONLINE       0     0     0
            c3t21d0    ONLINE       0     0     0
            c3t22d0    ONLINE       0     0     0
        spares
          c3t23d0      INUSE     currently in use

errors: No known data errors
# zpool replace -f Export c3t20d0
invalid vdev specification
the following errors must be manually repaired:
/dev/dsk/c3t20d0s0 is part of active ZFS pool Export. Please see zpool(1M).
#