Replacing a failed drive in an md raid1/raid10

• Check if the kernel already removed the faild drive from the arrays: # mdadm --detail /dev/md0
  • If not, remove it by hand: # mdadm /dev/md0 --remove /dev/sda1
  • If in an array a partition of the failed drive is not marked as faulty, before removing run # mdadm --manage /dev/md1 --fail /dev/sda2
• Insert a new physical disk
• Copy the partition table to the new drive from its mirror:
  • For gpt partition table: sgdisk -R /dev/sda /dev/sdb (from sdb to sda)
    • sgdisk -G /dev/sdb