5.9.9.2. Rebuilding a RAID array
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 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/sdc3 mdadm --manage /dev/md0 -a /dev/sdc3 Check the array. mdadm --detail /dev/md0