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I'm probably never going to write the actual article I'd originally intended these charts for. But if you want to see the difference between latencies between #OpenZFS and #btrfs on an eight-drive system that's creating and replicating automated snapshots regularly, here ya go.

We're looking at fio random access, limited to (simultaneous) 8MiB/sec read and 23.0MiB/sec write. The system has eight 12TB Ironwolf rust drives, in four ZFS mirrors vs one eight-wide btrfs-raid1.