You're reading from VMware vSphere 6.7 Data Center Design Cookbook - Third Edition

Product typeBook

Published inMar 2019

PublisherPackt

ISBN-139781789801514

Edition3rd Edition

Tools

vSphere

Concepts

Cloud Computing

Authors (2):

Mike Brown

Hersey Cartwright

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 the workloads are CPU-intensive, the vCPU-to-core ratio will need to be smaller; if the 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 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.

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VMware vSphere 6.7 Data Center Design Cookbook - Third Edition

Published in: Mar 2019Publisher: PacktISBN-13: 9781789801514

Authors (2)

Mike Brown

Mike Brown is an army veteran and full-stack data center engineer with over 10 years in IT, with the cage nut scars to prove it. Mike has held many positions in IT, from helpdesk to systems administrator to engineer and consultant. His technical achievements include VCIX6-DCV and other VMware, Cisco, NetApp, and Microsoft certifications.
Read more about Mike Brown

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

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