root@alumno:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdd[1] sdc[0]
      7912436 blocks super 1.2 [2/2] [UU]
      [=>...................]  resync =  7.1% (562176/7912436) finish=48.7min speed=2512K/sec

unused devices: <none>
root@alumno:~# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Mon Jan 28 11:09:49 2013
     Raid Level : raid1
     Array Size : 7912436 (7.55 GiB 8.10 GB)
  Used Dev Size : 7912436 (7.55 GiB 8.10 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Mon Jan 28 11:29:34 2013
          State : clean, resyncing
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

 Rebuild Status : 7% complete

           Name : alumno:0  (local to host alumno)
           UUID : fc1db1a2:3b980d47:0b6022b2:09b9dd11
         Events : 1

    Number   Major   Minor   RaidDevice State
       0       8       32        0      active sync   /dev/sdc
       1       8       48        1      active sync   /dev/sdd