A customer of mine today asked about the the results from a recently run benchmark of hypervisors published by Virtualization Review in which ESX, Hyper-V, and XenServer were compared. There is a post on the VMware blog questioning the configuration of the benchmark environment, and thus the results and conclusions from the benchmark. I wanted to share both of these links for those who may hve seen only the report and were scratching their heads as well.
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Since the benchmark was highly based on SQL server running in a VM, this seems a good time to also share additional research recently done on SQL Server and shared at VMworld 2009 in France. This performance research sheds some light on that fact that SQL Server Performance Problems are Not Due to VMware. After hearing lots of customer complaints about poor SQL server performance last year at VMworld in Las Vegas, VMware’s performance team spent three months looking at every way increased performance could be sqeezed out of SQL Server by tweaking ESX, the guest OS, and SQL Server. The net result was that most performance issues seen in running SQL Server virtualized on ESX come from mis-configurations in the other components and not from ESX.