Comment 19 for bug 925280

Instead of unplugging the device can you do this:
1) boot, fully synced
2) # mdadm --fail /dev/md0 /dev/sda1
3) # reboot
4) # mdadm --detail /dev/md0
5) # mdadm --add /dev/md0 /dev/sda1
6) # mdadm --detail /dev/md0

With unplugging the device:
1) boot, fully synced
2) shutdown
3) unplug the harddrive
4) boot degraded
5) # mdadm --fail /dev/md0 detached
6) shutdown
7) attach the harddrive back
8) # mdadm --detail /dev/md0
9) # mdadm --add /dev/md0 /dev/sda1