Hi,
We have a problem with performance on pass-thru disks on our VMs and Hyper-V hosts. When we directly provision LUNs from 3PAR via Fibre HBAs the performance is shocking (diskspd tests). However, when we use a VHDx file stored on the same LUN the performance is nearly 3 times faster.
Surely this doesnt sound right. We also tried provisioning a SSD volume from our 3PAR but the performance on this is the same compared to VHDx. How can VHDx be faster than SSD volume. Anyone got any ideas on this? What sort of performance do you see on your pass-thru disks compared to VHDx.
Really struggling to figure out what could cause should dramatic difference. Any help or suggestions highly appreciated.
The diskspd parameters i am using are: -o8 -t1 -c25G -d120.
Thank You