Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md1 : active raid1 sda3[1] sdb3[0] 6287296 blocks super 1.2 [2/2] [UU] md2 : active raid1 sdb4[0] sda4[1] 492657792 blocks super 1.2 [2/2] [UU] md0 : active raid1 sda2[1] sdb2[0] 1023936 blocks [2/2] [UU] unused devices: