zpool status
  pool: pool1
 state: DEGRADED
status: One or more devices has experienced an unrecoverable error.  An
	attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
	using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://www.sun.com/msg/ZFS-8000-9P
  scan: resilvered 952G in 36h47m with 0 errors on Fri Nov 28 10:49:13 2014
config:

	NAME                       STATE     READ WRITE CKSUM
	pool1                      DEGRADED     0     0     0
	  raidz2-0                 DEGRADED     0     0     0
	    ada5                   ONLINE       0     0     0
	    ada0                   ONLINE       0     0     0
	    ada4                   ONLINE       0     0     5
	    ada6                   ONLINE       0     0     0
	    ada2                   ONLINE       0     0     0
	    replacing-5            DEGRADED     0     0     2
	      3293354006190780552  OFFLINE      0     0     0  was /dev/dsk/ada3
	      ada3                 ONLINE       0     0     0
	    ada1                   ONLINE       0     0     0