root@server [~]# cat /proc/mdstat
Personalities : [raid1] 
md2 : active raid1 sdb2[1] sda2[0]
      20972736 blocks [2/2] [UU]
      
md1 : active raid1 sdb3[1] sda3[0]
      1052160 blocks [2/2] [UU]
      
md3 : active raid1 sda5[0]
      55994432 blocks [2/1] [U_]
      
md0 : active raid1 sdb1[1] sda1[0]
      104320 blocks [2/2] [UU]
      
unused devices: <none>