cat /proc/mdstat
Personalities : [raid1] 
md1 : active raid1 sda1[0] sdb1[1]
      1951852 blocks super 1.0 [2/2] [UU]
      
md0 : active raid1 sda2[2] sdb2[3]
      35156920 blocks super 1.2 [2/2] [UU]
      
unused devices: <none>
--(~)--