sudo mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Thu May 17 18:15:55 2007
     Raid Level : raid5
     Array Size : 490223232 (467.51 GiB 501.99 GB)
    Device Size : 245111616 (233.76 GiB 250.99 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Thu May 17 18:15:55 2007
          State : clean, degraded, recovering
 Active Devices : 2
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 64K

 Rebuild Status : 4% complete

           UUID : f271f5d2:ddaf7eb2:da2d099e:d0270e4f (local to host Storage)
         Events : 0.1

    Number   Major   Minor   RaidDevice State
       0      33        1        0      active sync   /dev/hde1
       1      56        1        1      active sync   /dev/hdi1
       3      34        1        2      spare rebuilding   /dev/hdg1