VM Sizing Best Practices in vSphere

Why Does VM Sizing Matter?

“Understanding elemental behavior is crucial for building a stable, consistent and proper performing infrastructure” – Frank Denneman, Sr. Staff Architect, VMware​

When creating a VM in ESXi, the cores per socket layout is important to the guest OS since it is ultimately the operating system making scheduling decisions based on the hardware architecture it sees​. When VMs are created, assigning virtual CPUs and cores per socket should be a consideration since performance could vary between 1×16, 16×1, 2×8 and 4×4 configurations​.  VMs with large memory requirements may change the optimal virtual CPU socket allocation depending on physical resources of the host. This post is to discuss sizing VMs and how the default cores per socket value might not be the best for the performance of the virtual machine. ​I’m not going to get into right-sizing, which is a different topic, so I’ll cover that in a future. Keep reading for a few list of best practices for cores-per-socket values, when to use Hot Add and using hyper threads to create monster VMs. Continue reading “VM Sizing Best Practices in vSphere”

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