root@c-754:~# mdadm --detail /dev/md4
/dev/md4:
        Version : 00.90.03
  Creation Time : Fri Sep 14 14:40:17 2007
     Raid Level : raid1
     Array Size : 129411520 (123.42 GiB 132.52 GB)
    Device Size : 129411520 (123.42 GiB 132.52 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 4
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Wed Feb  6 22:30:27 2008
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : e1a45655:385f179d:6be38dd6:bc7f1f45
         Events : 0.10

    Number   Major   Minor   RaidDevice State
       0       8        4        0      active sync   /dev/sda4
       1       8       20        1      active sync   /dev/sdb4
root@c-754:~#