odroid@ODROID-H2:~$ cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid6 sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1] sda1[0]
      3906514944 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU]
      [=>...................]  resync =  9.6% (93909272/976628736) finish=120.2min speed=122360K/sec
      bitmap: 8/8 pages [32KB], 65536KB chunk

unused devices: <none>