4 ms·
More flexibility in drives. Btrfs's RAID1, isn't actually RAID1 where everything is written to all the drives, but closer to RAID10 it writes all data to copies
by ThatPlayer 2y ago
More flexibility in drives. Btrfs's RAID1, isn't actually RAID1 where everything is written to all the drives, but closer to RAID10 it writes all data to copies on 2 drives. So you can have a 1+2+3 TB drive in an array and still get 3TB of usable storage, or even 1+1+1+1+4. And you can add/remove single drives easily.
You can also set different RAID levels for metadata versus data, because the raid knows the difference. At some point in the future you might be able to set it per-file too.