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You're reading from VMware vSphere 6.x Datacenter Design Cookbook - Second Edition

Product typeBook

Published inJun 2016

PublisherPackt

ISBN-139781785283468

Edition2nd Edition

Tools

vSphere

Concepts

Cloud Computing

Authors (2):

Hersey Cartwright

kim bottu

View More author details

Determining the vCPU-to-core ratio

The number of virtual machine vCPUs allocated compared to the number of physical CPU cores available is the vCPU-to-core ratio. Determining this ratio will depend on the CPU utilization of the workloads.

If workloads are CPU-intensive, the vCPU-to-core ratio will need to be smaller; if workloads are not CPU-intensive, the vCPU-to-core ratio can be larger. A typical vCPU-to-core ratio for server workloads is about 4:1—four vCPUs allocated for each available physical core. However, this can be much higher if the workloads are not CPU-intensive.

A vCPU-to-core ratio that is too large can result in high CPU Ready times—the percentage of time that a virtual machine is ready but is unable to be scheduled to run on the physical CPU—which will have a negative impact on the virtual machine's performance.

How to do it…

Determine the number of vCPUs required:
vCPUs per Workload x Number of Workloads Per Host = Number of vCPUs Required
Determine the vCPU-to-core ratio based...

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VMware vSphere 6.x Datacenter Design Cookbook - Second Edition

Published in: Jun 2016Publisher: PacktISBN-13: 9781785283468

Authors (2)

Hersey Cartwright

Hersey Cartwright has worked in the technology industry since 1996 in many roles, from help desk support to IT management. He first started working with VMware technologies in 2006. He is currently a Solutions Engineer for VMware, where he designs, sells, and supports VMware software-defined datacenter products in enterprise environments within the healthcare industry. He has experience working with a wide variety of server, storage, and network platforms.
Read more about Hersey Cartwright

kim bottu

Since 2012 Kim Bottu has been the EMEA Virtualization Engineer for an international Biglaw firm where he focuses mainly on virtual datacenter performance optimization and virtual datacenter design. Kim holds the following certifications and honors: VCA-NV, VCP5-DCV, VCP6-DCV, VCAP5-DCD and has been named vExpert 2016. Kim can be reached at www.vMusketeers.com.
Read more about kim bottu

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