cat /proc/mdstat Personalities :  [raid1] read_ahead 1024 sectors  md1 : active raid1 sda3[0] sdb3[1] 522048 blocks [2/2] [U_]  md0 : active raid1 sda2[0] sdb2[1] 4192896 blocks [2/2] [U_]  md2 : active raid1 sda1[0] sdb1[1] 128384 blocks [2/2] [U_]  unused devices: < ...