Server 2k8r2 Hyper-v guest disk performance

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New Member
Dec 23, 2012
Hi guys

I'm new to this forum, but have been reading articles from the site on several occations.

My problem lately, has been that I seem to be missing out on hardware performance in my server setup. It is a setup which I have built over a few years, and it is in no way a production environment. Only for fun and games.

The essential hardware:

Supermicro X8DTH-6

1x Intel® Xeon® Processor E5620 (12M Cache, 2.40 GHz, 5.86 GT/s Intel® QPI)

6x Hynix HMT31GR7BFR4C-H9 8gb DDR3 ECC modules

IBM ServeRAID M5015

4x Seagate ST3300555SS 10K RPM 300GB SAS drives

Let me just illustrate what I mean:

ATTO Benchmark - Former Highend gamerpc with 4x320GB Seagate SATA disks

ATTO Benchmark - Server machine as described above, with 4x300GB Seagate SAS drives

Question is.. Why would the performance be so degraded, just by running it in a virtual machine? The VM has 8GB dedicated RAM, 4 CPU cores, a 30GB SSD as O/S drive, and as the other pc it is running on a Windows 7 platform.

I'd appreciate any help I can get, seeing as this is a little annoying when you spend the money for performance, and don't quite get it.

Thanks in advance! Best regards



Staff member
Dec 21, 2010
I'm clearly tired. With 4x drives you are getting over 400MB/s write and 1.7GB/s read performance? That is pretty good. The huge read numbers are because you are hitting the LSI 512MB cache. The Seagate ST3300555SS are from 2008 or so so 100MB/s each is not too bad.