[root@office /]# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Fri Dec 29 19:00:19 2006
     Raid Level : raid5
     Array Size : 390716672 (372.62 GiB 400.09 GB)
    Device Size : 195358336 (186.31 GiB 200.05 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Fri Dec 29 19:00:19 2006
          State : clean, degraded, recovering
 Active Devices : 2
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 128K

 Rebuild Status : 9% complete

           UUID : 27787b9e:b2504a64:5adb5cd6:887443fb
         Events : 0.1

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       3       8       33        2      spare rebuilding   /dev/sdc1