$ cat /proc/mdstat

$ cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdb1[1] sda1[0]
200704 blocks [2/2] [UU]

md3 : active raid1 sdb2[1] sda2[0]
2208832 blocks [2/2] [UU]

md4 : active raid1 sdb5[1] sda5[0]
21687616 blocks [2/2] [UU]

md5 : active raid1 sdb6[1] sda6[0]
132190720 blocks [2/2] [UU]

md1 : active raid1 sdb9[1] hda6[0]
48949952 blocks [2/2] [UU]

md0 : active raid1 sdb8[1] hda5[0]
10000320 blocks [2/2] [UU]