# cat /proc/mdstat
Personalities : [raid5] [raid4]
md1 : active raid5 sda4[0] sdd4[2]
      439008000 blocks level 5, 64k chunk, algorithm 2 [3/2] [U_U]

md0 : active raid5 sdd3[1] sda3[0]
      48837376 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]