# mdadm -E /dev/sdb1

/dev/sdb1:
          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 : 1
Preferred Minor : 125

    Update Time : Mon Jan 13 21:15:55 2014
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0
       Checksum : b331f3e8 - correct
         Events : 568


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

   0     0       0        0        0      removed
   1     1       8       17        1      active sync   /dev/sdb1


# mdadm -E /dev/sdb2
/dev/sdb2:
          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 : 2
Preferred Minor : 1

    Update Time : Sun Jan 12 06:43:11 2014
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : d1b36e81 - correct
         Events : 758


      Number   Major   Minor   RaidDevice State
this     1       8       18        1      active sync   /dev/sdb2

   0     0       8        2        0      active sync   /dev/sda2
   1     1       8       18        1      active sync   /dev/sdb2


# mdadm -E /dev/sdb3
/dev/sdb3:
          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 : 2
Preferred Minor : 2

    Update Time : Mon Jan 13 00:31:53 2014
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : d874eece - correct
         Events : 831


      Number   Major   Minor   RaidDevice State
this     1       8       19        1      active sync   /dev/sdb3

   0     0       8        3        0      active sync   /dev/sda3
   1     1       8       19        1      active sync   /dev/sdb3