ZeroFS doesn't exploit ZFS strengths with no native ZFS support, just an afterthought with NBD + SlateDB LSM Good for small burst workloads where everything kept it in memory for LSM batch writes. Once compaction hits all bets off with performance and not sure about crash consistency since it is playing with fire. ZFS special vdev + ZIL on ssd is much safer. No need for LSM. MayaNAS ZFS metadata at SSD speed and large blocks get throughput from high latency S3 at network speed.