Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdb2[1] sda2[0](F)
      523712 blocks super 1.2 [2/1] [_U]

md2 : active raid1 sdb3[1] sda3[0](F)
      1073610752 blocks super 1.2 [2/1] [_U]
      bitmap: 7/8 pages [28KB], 65536KB chunk

md3 : active raid1 sdb4[1] sda4[0](F)
      1839090112 blocks super 1.2 [2/1] [_U]
      bitmap: 4/14 pages [16KB], 65536KB chunk

md0 : active raid1 sdb1[1] sda1[0](F)
      16760832 blocks super 1.2 [2/1] [_U]

unused devices: <none>