Tech question @JamesNT or @Sandeep

Fast SSD drives look good on the 2019 Hyper-V Host tested via Cyrstaldiskmark. Assign only VHDX file on the SSD to the VM. Within the VM, IOPS and Random 4kQD1 performance drops by about 40-50%. Sequential performance only drops 10%.

Tried QOS settings, tried turning off any other VMs, tried IObalance registry settings. Nothing allows less drop in performance going from host to client. Is there a way to get closer to native IOPS in a VM?

SSDs tried: Samsung 970 Pro and Optane 905p both very fast sustained low queue depth (SQL type load). Both through a PCIE adapter card.

btw Optane 905p 960gb is now on sale for $400. Very fast for database applications. Also there is a reddit story of a signficant number of Samsung 980 Pros going bad after 6-12m of use -- I had one fail with massive bad sectors. Fortunately not on my server.

Larry
Solo IM
Midwest