Btrfs raid 1 works great. I have 3 10tb drives in a raid1c2 for a total of 15tb of space. Btrfs raid1 allows you to use any combination of drives and sizes. If

Btrfs raid 1 works great. I have 3 10tb drives in a raid1c2 for a total of 15tb of space. Btrfs raid1 allows you to use any combination of drives and sizes. If I would have one 12tb drive instead of one 10tb I would have had 16tb of usable space. For raid5/6 I dont use the built in raid, but mdraid. I stopped waiting for btrfs raid56 to stabilise.