HyperV HDD Performance in host very slow

I’ve been happily running HyperV on Windows Server 2008 & 2008 R2 for the last couple of years. My Servers are really big PCs, so nothing special.

I’ve taken the mobo that used to be my HyperV server, and installed Windows 8 on it. It has 16GB RAM & 3.1 GHz Quad core so quite capable of running 3 or 4 VMs. This is what is was doing with Windows 2008.

I’ve added HyperV role to Windows 8, and the HDD performance on the host grinds to a halt when more than 1 VM is running. Disk average throughput measured by HD Tune Pro drops from 135MB with no VM, to 44MB with 1, all the way down to 0.7 MB with 4.

Disk Access time drops from 15.3ms to 23.8, then finally 606.8 ms.

My new ‘Server’ is running the same HDD and does not show a similar drop in performance. It’s happily running 6VMs.

I think that leaves 2 possible problems: either the HDD is starting to fail, or HyperV in Windows 8 doesn’t work as well as in Server 2008 R2.

Any thoughts? Is it time to replace the HDD?




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