RAID1 is about mirroring disks, BTRFS RAID1 mirrors block groups. Plus traditionally a RAID1 of 3 disks will mirror the same data on all disks, which is differe

RAID1 is about mirroring disks, BTRFS RAID1 mirrors block groups. Plus traditionally a RAID1 of 3 disks will mirror the same data on all disks, which is different to how the RAID1 mode on BTRFS acts. So the name leads to misunderstandings since it doesn't act like RAID1 at all. It'd be way easier to talk about if it had a unique name, and you could say "It's like RAID1". Despite all that I do like the mode, and use it in a few places.