# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue May 15 17:46:12 2012
     Raid Level : raid5
     Array Size : 9767564800 (9315.08 GiB 10001.99 GB)
  Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
   Raid Devices : 6
  Total Devices : 6
    Persistence : Superblock is persistent

    Update Time : Tue Nov 27 13:01:45 2012
          State : clean, FAILED
 Active Devices : 4
Working Devices : 5
 Failed Devices : 1
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 512K

           Name : shrew:0  (local to host shrew)
           UUID : 4c422ffe:5623d007:b15856e7:098142f0
         Events : 40161

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       0        0        1      removed
       2       8       16        2      active sync   /dev/sdb
       3       8       32        3      active sync   /dev/sdc
       4       8       64        4      active sync   /dev/sde
       6       8       80        5      active sync   /dev/sdf

       1       8       48        -      faulty spare   /dev/sdd
       7       8        0        -      spare   /dev/sda