# zpool status
  pool: tank
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
 scan: resilver in progress since Fri Jul 26 12:47:30 2013
    905G scanned out of 10.3T at 160M/s, 17h4m to go
    215G resilvered, 8.59% done
config:

        NAME                                         STATE     READ WRITE CKSUM
        tank                                         ONLINE       0     0     0
          raidz1-0                                   ONLINE       0     0     0
            sda                                      ONLINE       0     0     0
            sdb                                      ONLINE       0     0     0
            sdc                                      ONLINE       0     0     0
            replacing-3                              ONLINE       0     0    17
              sdd                                    ONLINE       0     0     0  (resilvering)
              ata-ST4000DM000-1F2168_Z300MHWF-part2  ONLINE       0     0     0  (resilvering)