Ersetzen einer defekten Festplatte

  1. Use
    mdadm --manage /dev/md0 -r /dev/sdd

    to remove the drive that was marked as faulty from the array.
  2. Power down and replace the drive with a good drive.
  3. 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
  4. delete superblock on all partitions
    mdadm --zero-superblock /dev/sdd2
  5. Add the proper partition on the new drive into the array
  6. mdadm --manage /dev/md0 -a /dev/sdd2
  7. Sit back and wait for the recovery to happen, you can
    cat /proc/mdstat

    to watch its progress; you should see something like: