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Mounting a degraded raid1 partition read-only

  • Use mdadm examine to extract the offset of the filesystem:
sudo mdadm --examine /dev/shirka_hdd/raid_root
  • Use the “data offset” value and multiply it with 512 to create a loopback device:
losetup --find --show --read-only --offset $((2048*512)) /dev/shirka_hdd/raid_root

* If you have to decrypt it remember to use cryptsetup luksOpen now
cryptsetup luksOpen /dev/loop0 shirka-raid-root-unencrypt
  • Now mount the partition. To mount an ext4 partition read-only use:
mount -oro,noload /dev/mapper/shirka-raid-root-unencrypt /mnt
mounting_degraded_raid1.txt · Last modified: 2021/01/31 23:55 (external edit)