Create Linux dm-crypt BTRFS RAID 1

Wed, 12 Feb 2020 08:35:36 +0000

To do this you need two empty drives, with the guide below all data on the drive will be lost if it is not empty!

1. Install cryptsetup

apt-get install cryptsetup

2. Create the dm-crypt

cryptsetup -y -v luksFormat /dev/sdb
cryptsetup -y -v luksFormat /dev/sdc

(Make sure to use the correct device. To show available devices use “lsblk”.)

3. Mount the cryptsetup disk

cryptsetup luksOpen /dev/sdb disk1
cryptsetup luksOpen /dev/sdc disk2

4. Check if this was successful

ls -l /dev/mapper/disk*

or
sudo cryptsetup -v status disk1
sudo cryptsetup -v status disk2

5. Create BTRFS volume RAID 1, this means all data and meta-data is mirrored, which means if you use 2 drives with i.e. 4TB each you can only use 4TG over all in the BTRFS mounted volume.

mkfs.btrfs -m raid1 -d raid1 /dev/mapper/disk1 /dev/mapper/disk2