sudo mdadm --detail /dev/md0

sudo mdadm --detail /dev/md0


/dev/md0:
        Version : 1.2
  Creation Time : Fri Dec  9 17:36:43 2011
     Raid Level : raid1
     Array Size : 228572024 (217.98 GiB 234.06 GB)
  Used Dev Size : 228572024 (217.98 GiB 234.06 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Fri Jan 13 00:26:17 2012
          State : active, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : xxxxxx-server:0  (local to host xxxxxx-server)
           UUID : 17c75e16:496776fb:29ecc2e1:393e81ed
         Events : 6238

    Number   Major   Minor   RaidDevice State
       2       8        2        0      active sync   /dev/sda2
       1       0        0        1      removed