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FYI I got 66 GiB/s using 10 Samsung 980 Pro PCIe 4.0 SSDs on a ThreadRipper Pro workstation:

https://news.ycombinator.com/item?id=25956670

Had to use direct I/O and use random large IO patterns to avoid various caching, buffering and prefetching effects.

You are using a PCI 4.0 SSD compared to the SSD used in this RAIDZ2 with PCIE 3.0

10 PCIe 4.0 SSDs give you maximum of around 70GB/s.

The test show sustained throughput of 80GB/s without compression. Which is still higher than the maximum allowed by 8 x 4 PCIE 3.0 slot at total of 32GB/s.

Waiting for some ZFS expert to give a plausible explanation.

Reply on news.ycombinator.com