Page History

...

mdadm --manage --add /dev/md/0 /dev/sdb1

...

Disabling an underlying device

This is intended to:

• prevent damage in case the underlying device recovers and fails again
• stop spurious error messages
• prepare for replacement

For example:

# mdadm --manage --fail /dev/md1 /dev/sdb2
mdadm: set /dev/sdb2 faulty in /dev/md1
# mdadm --manage --remove /dev/md1 /dev/sdb2
mdadm: hot removed /dev/sdb2 from /dev/md1
# mdadm --zero-superblock /dev/sdb2
mdadm: Unrecognised md component device - /dev/sdb2
[probably failed because sdb was bad]
# echo "1" > /sys/block/sdb/device/delete

Remove an underlying device (md device not in use)

Removing /dev/md1 as an example ...

...