IIRC btrfs operates on chunks of 1gb instead on the drives themselves. So each chunk is present on two drives for raid1. Data point: I have 10 disks between 1 a

IIRC btrfs operates on chunks of 1gb instead on the drives themselves. So each chunk is present on two drives for raid1. Data point: I have 10 disks between 1 and 4 TB in a single btrfs raid1 (failure rates don't matter for that private build-from-scrap backup server with a few hours uptime/week). Don't know if raid5/6 are still considered unstable, but would be very interested as well. //edit: shish2k was a bit faster and says nope to raid5/6