mgerdts parent
In addition to my other comments about parallel IO and unbuffered IO, be aware that WS2022 has (had?) a rather slow NVMe driver. It has been improved in WS2025.
I just benchmarked this to death using a 24-core VM with two different kinds of NVMe storage.
Windows Server 2025 is somewhat better on reads but only at low parallelism.
There’s no difference on writes.
I just stumbled across this:
> Native NVMe is now generally available (GA) with an opt-in model (disabled by default as of October’s latest cumulative update for WS2025).
https://www.elevenforum.com/t/announcing-native-nvme-in-wind...