Восстанавливаем raid1

Personalities : [raid1]
md2 : active raid1 sdb5[0]
      377661248 blocks super 1.1 [2/1] [U_]
      bitmap: 3/3 pages [12KB], 65536KB chunk

md1 : active raid1 sdb2[0]
      51167104 blocks super 1.1 [2/1] [U_]
      bitmap: 1/1 pages [4KB], 65536KB chunk

md0 : active raid1 sda1[1]
      51199872 blocks super 1.0 [2/1] [_U]
      bitmap: 1/1 pages [4KB], 65536KB chunk

Смотрим что выпало из рейда
и добавляем

• mdadm --manage /dev/md2 --add /dev/sda5
• mdadm --manage /dev/md0 --add /dev/sdb1
• mdadm --manage /dev/md1 --add /dev/sda2

Следим за процессом

• watch --interval=1 cat /proc/mdstat

md2 : active raid1 sda5[1] sdb5[0]
      377661248 blocks super 1.1 [2/1] [U_]
      [=================>...]  recovery = 85.3% (322315584/377661248) finish=31.7min speed=29014K/sec
      bitmap: 3/3 pages [12KB], 65536KB chunk

md1 : active raid1 sda2[1] sdb2[0]
      51167104 blocks super 1.1 [2/1] [U_]
      resync=DELAYED
      bitmap: 1/1 pages [4KB], 65536KB chunk

md0 : active raid1 sdb1[0] sda1[1]
      51199872 blocks super 1.0 [2/1] [_U]
      resync=DELAYED
      bitmap: 1/1 pages [4KB], 65536KB chunk