cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdd1[1] sdc1[0]
      244065408 blocks super 1.2 [2/2] [UU]
      [=>...................]  resync =  6.4% (15812032/244065408) finish=19.1min speed=198449K/sec
      bitmap: 2/2 pages [8KB], 65536KB chunk
unused devices: <none>