$ sudo /sbin/mdadm --detail /dev/md0
/dev/md0:
        Version : 0.90
  Creation Time : Mon Nov  3 05:10:50 2008
     Raid Level : raid1
     Array Size : 14648320 (13.97 GiB 15.00 GB)
  Used Dev Size : 14648320 (13.97 GiB 15.00 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Fri May  1 13:34:12 2009
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : a7734e11:0ab8f432:5793ec45:70d2fbf3
         Events : 0.37

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1