How many cores should I plan for with Hyper-V?

Q. When planning for Hyper-V performance should I use the number of logical processors or the number of cores?

A. In my experience for performance planning purposes it is best to base capacity based on the number of cores and not the number of threads (logical processors). This is also useful since the hypervisor also has to do work and the additional capacity of the processors enabled through hyper-threading can be utilized by the hypervisor saving the rest for the VMs.

Each week, John Savill answers all of your toughest tech questions about the worlds of Windows Server, Azure, and beyond. Read his past IT advice here, and email your questions to [email protected].