Alex Elsayed wrote:
Since Btrfs has implemented raid5/6 support (meaning raidz is only a feature gain if you want 3x parity, which is unlikely to be useful for an OSD[1]), the checksumming may be the only real benefit since it supports sha256 (in addition to the non-cryptographic fletcher2/fletcher4), whereas btrfs only has crc32c at this time.
Plus (in my real-world experience) *far* better robustness. If Ceph could use either and both had feature parity, I'd choose ZFS in a heartbeat. I've had too many simple Btrfs filesystems go corrupt, not even using any fancy RAID features.
I wasn't aware that Ceph was using btrfs' file-scope clone command. ZFS doesn't have that, although in theory with the new capabilities system it could be supported in one implementation without requiring an on-disk format change.
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