daunderground@ubuntu:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdb[4] sdd1[3]
      3906763776 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [U_U]

unused devices: <none>