I have a btrfs raid1 composed of two entire, large harddisks of the same size. Now I would like to migrate the data to a btrfs raid1 composed of two encrypted luks-devices on the same harddisks. I have a separate copy of the data on another box, so my plan is to remove one device from the raid1, create a luks volume on the removed device, create a btrfs filesystem on the luks device, copy the data onto the new device, create a luks volume on the second device and add the second device to the encrypted btrfs system.

Does this sound reasonable and does anyone have a recipe for that? Or should I better buy a third harddisk for the migration?

I have a btrfs raid1 composed of two entire, large harddisks of the same size. Now I would like to migrate the data to a btrfs raid1 composed of two encrypted luks-devices on the same harddisks. I have separate copies of the data on other boxes as a backup. My plan is to remove one device from the raid1, create a luks volume on the removed device, create a btrfs filesystem on the luks device, copy the data onto the new device, create a luks volume on the second device and add the second device to the encrypted btrfs system.

Does this sound reasonable and does anyone have a recipe for that? Or should I better buy a third harddisk for the migration?