# mdadm -E /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : 9bcc721c:543ea547:776c2c25:004bd7b2
  Creation Time : Thu Mar  1 10:18:21 2012
     Raid Level : raid1
  Used Dev Size : 2096064 (2047.28 MiB 2146.37 MB)
     Array Size : 2096064 (2047.28 MiB 2146.37 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Mon Jan 13 12:12:28 2014
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
       Checksum : b331741b - correct
         Events : 576


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

   0     0       8        1        0      active sync   /dev/sda1
   1     1       0        0        1      faulty removed


# mdadm -E /dev/sda2
/dev/sda2:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : 67a4b7b8:a701f343:776c2c25:004bd7b2
  Creation Time : Thu Mar  1 10:18:21 2012
     Raid Level : raid1
  Used Dev Size : 524224 (512.02 MiB 536.81 MB)
     Array Size : 524224 (512.02 MiB 536.81 MB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 1

    Update Time : Mon Jan 13 16:57:48 2014
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
       Checksum : d1b54fef - correct
         Events : 764


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

   0     0       8        2        0      active sync   /dev/sda2
   1     1       0        0        1      faulty removed



# mdadm -E /dev/sda3
/dev/sda3:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : 07b73f05:b68bb873:776c2c25:004bd7b2
  Creation Time : Thu Mar  1 10:18:21 2012
     Raid Level : raid1
  Used Dev Size : 1462516672 (1394.76 GiB 1497.62 GB)
     Array Size : 1462516672 (1394.76 GiB 1497.62 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 2

    Update Time : Mon Jan 13 22:31:35 2014
          State : active
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
       Checksum : d876dc3e - correct
         Events : 48013


      Number   Major   Minor   RaidDevice State
this     0       8        3        0      active sync   /dev/sda3

   0     0       8        3        0      active sync   /dev/sda3
   1     1       0        0        1      faulty removed