cat /proc/mdstat

returns:

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] 
md4 : active raid1 sdi3[0]
      23432007232 blocks super 1.0 [1/1] [U]
 
md3 : active raid1 sdk3[0]
      23432007232 blocks super 1.0 [1/1] [U]
 
md1 : active raid6 sdf3[0] sdd3[7] sdg3[6] sdh3[5] sdc3[4] sdb3[2] sda3[3] sde3[1]
      46824429696 blocks super 1.0 level 6, 64k chunk, algorithm 2 [8/8] [UUUUUUUU]
      bitmap: 21/59 pages [84KB], 65536KB chunk
 
md322 : active raid1 sdc5[7](S) sdd5[6](S) sda5[5](S) sdb5[4](S) sdg5[3](S) sdh5[2](S) sde5[1] sdf5[0]
      7235136 blocks super 1.0 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk
 
md256 : active raid1 sdc2[7](S) sdd2[6](S) sda2[5](S) sdb2[4](S) sdg2[3](S) sdh2[2](S) sde2[1] sdf2[0]
      530112 blocks super 1.0 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk
 
md13 : active raid1 sdd4[38] sdf4[0] sde4[32] sda4[34] sdb4[33] sdc4[35] sdh4[36] sdg4[37]
      458880 blocks super 1.0 [33/8] [UUUUUUUU_________________________]
      bitmap: 1/1 pages [4KB], 65536KB chunk
 
md9 : active raid1 sdd1[38] sdf1[0] sde1[32] sda1[34] sdb1[33] sdc1[35] sdh1[36] sdg1[37]
      530048 blocks super 1.0 [32/8] [UUUUUUUU________________________]
      bitmap: 1/1 pages [4KB], 65536KB chunk
 
unused devices: <none>