Debunking the myths of why Vmware is better than Hyper-V – Performance

With this post, I’m continuing my series on the myths surrounding Hyper-V that I encounter in my workdays. Previously, I’ve written about Transparent Page Sharing, Memory overcommit and disk footprint.

Today I’m gonna write about another major issue I hear from customers, namely performance, and one that is completely understandable. Everyone can relate to wanting the most bang for your buck.
When looking at the Vmware sales pitch on their website (and one that is repeated time and again from their sales reps) it sounds like Vmware is the best option to buy:

VMware vSphere—the industry’s first x86 “bare-metal” hypervisor—is the most reliable and robust hypervisor. Launched in 2001 and now in its fifth generation, VMware vSphere has been production-proven in tens of thousands of customer deployments all over the world.

Other hypervisors are less mature, unproven in a wide cross-section of production datacenters, and lacking core capabilities needed to deliver the reliability, scalability, and performance that customers require.

You can clearly see from this text that Vmware believes their hypervisor to be superior in any way, including performance. But is this true?

Well, I can’t answer that and neither can most of the other people out there. Why is that?

Let’s snip a bit more from Vmware’s material, this time their EULA:

2.4 Benchmarking.You may use the Software to conduct internal performance testing and benchmarking studies. You may only publish or otherwise distribute the results of such studies to third parties as follows: (a) if with respect to VMware’s Workstation or Fusion products, only if You provide a copy of Your study to benchmark@vmware.comprior to distribution; (b) if with respect to any other Software, only if VMware has reviewed and approved of the methodology, assumptions and other parameters of the study (please contact VMware at benchmark@vmware.comto request such review and approval) prior to such publication and distribution.
As you can see, this clearly states that if you wish to do a benchmark pitching Hyper-V against Vmware, then you need Vmware’s approval for both doing the test, how you do it and afterwards for the results.
Wanna make a guess that a bad test for Vmware’s isn’t going to be approved?
So can you trust a vendor that claims superior performance, but is unwilling to allow tests where the results are approved by the said vendor… That’s up to you to decide…

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