Slow Hyper-V performance
Posted on 2013-11-19
Perhaps someone can help on this strange problem.
We´ve got a brand new HP ML350p G8 server with 1 4C processor, 36 GB RAM, 420i 512MB controller, 8x10krpm SAS drives.
The server is installed with Win 2012 R2 and a HyperV role.
- 2xdrives in RAID1 power the HyperV server C: drive
- 4xdrives in RAID10 create a disk for VHD files.
Strange problem: using CrystalMark we get 1,3 MB/s read and 10 MB/s write performance on the VHD disk from Windows 2012 Guest servers running an ERP system - big trouble.
Copying files to/from the guest works fine, 100 MB/s transfer of files, but the disktresstest shows very slow performance on 4K read/write test - and this affects the ERP system as it uses a lot of disk i/o.
Any tips? Tried updating controller driver, all disks are ok, tried running CrystalMark even from the local HyperV OS and still the same.