If you want something that deals with multiple tiers of fault tolerance, you should be looking at distributed filesystems (eg. Ceph) rather than single-system f

If you want something that deals with multiple tiers of fault tolerance, you should be looking at distributed filesystems (eg. Ceph) rather than single-system filesystems like ZFS and btrfs. Also keep an eye out for erasure coding as a keyword, since that usually implies more control over the degree of redundancy than a handful of RAID levels.