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cat /proc/mdstat Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md3 : active raid1 sda4[3] sdb4[2] 2778744127 blocks super 1.2 [2/1] [_U] [>....................] recovery = 1.3% (38884416/2778744127) finish=534.3min speed=85452K/sec md2 : active raid1 sda3[3] sdb3[2] 134216632 blocks super 1.2 [2/2] [UU] md1 : active raid1 sda2[3] sdb2[2] 524276 blocks super 1.2 [2/2] [UU] md0 : active (auto-read-only) raid1 sda1[3] sdb1[2] 16776120 blocks super 1.2 [2/2] [UU] unused devices: <none> mdadm --manage /dev/md0 --fail /dev/sda1 mdadm --manage /dev/md1 --fail /dev/sda2 mdadm --manage /dev/md2 --fail /dev/sda3 mdadm --manage /dev/md3 --fail /dev/sda4 mdadm --manage /dev/md0 --remove /dev/sda1 mdadm --manage /dev/md1 --remove /dev/sda2 mdadm --manage /dev/md2 --remove /dev/sda3 mdadm --manage /dev/md3 --remove /dev/sda4 shutdown and remove failed disk boot mdadm --manage /dev/md0 --add /dev/sda1 mdadm --manage /dev/md1 --add /dev/sda2 mdadm --manage /dev/md2 --add /dev/sda3 mdadm --manage /dev/md3 --add /dev/sda4 watch cat /proc/mdstat |