Is the throughput bad even with USB3? You're looking at 625MB/s which even after signalling overhead ought to be sufficient to saturate 3-4 magnetic disks. La

Is the throughput bad even with USB3? You're looking at 625MB/s which even after signalling overhead ought to be sufficient to saturate 3-4 magnetic disks. Latency might still be a concern but personally I've always found [non-ZFS] throughput to be great.