Btrfs, ZFS, and bcachefs under real workloads
A new benchmark suite compares multi-device CoW filesystems across core I/O, responsiveness, metadata work, and integrity—not just synthetic throughput. Its current cohort shows bcachefs scoring strongly on the aggregate workload mix, while Btrfs and ZFS vary substantially by layout.
Important caveat: the automated runs use loop devices on shared ephemeral VMs, so the author says to compare ratios rather than absolute MB/s; real-hardware runs are still being added. The benchmark sources and run history are public.