I built a Windows 2019 server with an NVMe storage pool and I'm using fio to test performance. Results from fio are in line with my expectations for this hardware, but I noticed something strange with Windows Performance Monitor. The physical disk r/w throughput counters are roughly double what they should be. This holds true for various different iodepth, numjobs, and block size options. Logical Disk throughput counters are accurate. In this screenshot, fio shows 11.1GiB/s and the physical disk shows about 22.2 GiB/s. Is there a logical explanation for this? Or is there a better disk monitoring tool to use, something like iostat for Windows? https://i.postimg.cc/zqrW8ZPk/windows-fio.png?dl=1 The storage pool is created as a simple stripe with no parity or mirroring and formatted as ReFS. Thanks, Elliott
