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5.9.9.2. Rebuilding a RAID array
Should
/proc/mdstat show that a problem exists with one of the RAID arrays, you can rebuild it by performing the following steps:
- Remove the disk from the raid array.
mdadm --manage /dev/md0 -r /dev/sdc3 - Remove the disk from the system.
- Using
fdisk, replace the removed disk and re-format the replacement disk. - Add the new disk back to the RAID array.
mdadm --manage /dev/md0 -a /dev/sdc3 - To restore the disk, perform a "software fail" the previous spare slice:
mdadm --manage --set-faulty /dev/md0 /dev/sdc3 - The system will now attempt to rebuild the array on the replaced disk. Use the following command to monitor status:
watch -n 1 cat /proc/mdstat - When the array is finished rebuilding, remove and then re-add the software-failed disk back to the array.
mdadm --manage /dev/md0 -r /dev/sdc3mdadm --manage /dev/md0 -a /dev/sdc3 - Check the array.
mdadm --detail /dev/md0
