root@srv-debian:/etc/network# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : inactive sdc1[0] sde1[2]
      3907021954 blocks super 1.2

unused devices: <none>
root@srv-debian:/etc/network# mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Sat Apr  2 01:17:39 2011
     Raid Level : raid5
  Used Dev Size : 1953510400 (1863.01 GiB 2000.39 GB)
   Raid Devices : 4
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Wed Jan  4 18:40:44 2012
          State : active, FAILED, Not Started
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 512K

  Delta Devices : 1, (3->4)

           Name : srv-debian:0  (local to host srv-debian)
           UUID : 4b327d72:30f51c06:95cb9b87:1f01a845
         Events : 36834

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       0        0        1      removed
       2       8       65        2      active sync   /dev/sde1
       3       0        0        3      removed
root@srv-debian:/etc/network#