I used default options with cryptsetup and mkfs.btrfs. However with cryptsetup also: "luksFormat", "--type luks2" and "--sector-size 4092", appiled to the whole device not a partition. About 2 years ago on a relatively fresh system. Can supply more info if needed. I know master key needs to be the same on all devices, let's put that aside for now.

Question is, is it feasible or is it advised to do something like this or not really?

Edited August 5, 20241 yr by steelsoap

Unlikely it will work since Unraid requires a specific partition layout, but you can try assigning one of the disks as a data disk, at worst it won't mount, but it won't damage the existing filesystem.

Alright, thanks. Sounds like a no go.