The latest release of vSphere has dramatically increased the scalability of virtual machines, enabling configurations of up to 64 virtual processors in a single virtual machine. With that many resources available it seems that the answer to performance is to do nothing more than to create larger virtual machines. There is much more that should go into deciding how much processing power goes into a virtual machine. This section reviews various features that are available in vSphere with regard to virtualizing CPUs. Where relevant, this document discusses the impact of those features to Exchange 2013 and the recommended practices for using those features.Hyperthreading causes capacity planning and monitoring challenges, and as a result, the expected gain in CPU overhead is likely not justified. Hyperthreading should be disabled by default for production Exchange servers and only enabled if absolutely necessary as a temporary measure to increase CPU capacity until additional hardware can be obtained.
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