buuser@backuntu:/$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdd1[3] sdb1[1] sdc1[2] sda1[0] sde1[4]
      3907039744 blocks level 5, 4k chunk, algorithm 2 [5/5] [UUUUU]

unused devices: <none>