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Replace faulty disk in linux md

Replacing a faulty drive in an mdadm managed RAID array.

Use “mdadm –manage /dev/md0 -r /dev/sdd” to remove the drive that was marked as faulty from the array.

Power up and set the partition table on the new drive to match those of the other drives in the array. Here we used “sfdisk -d /dev/sda | sfdisk /dev/sdd”.

Add the proper partition on the new drive into the array, “mdadm –manage /dev/md0 -a /dev/sdd2”

Sit back and wait for the recovery to happen, you can “cat /proc/mdstat” to watch its progress; you should see something like:

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