Book Image

vSphere High Performance Cookbook - Second Edition - Second Edition

By : Kevin Elder, Christopher Kusek, Prasenjit Sarkar
Book Image

vSphere High Performance Cookbook - Second Edition - Second Edition

By: Kevin Elder, Christopher Kusek, Prasenjit Sarkar

Overview of this book

vSphere is a mission-critical piece of software for many businesses. It is a complex tool, and incorrect design and deployment can create performance related issues that can negatively affect the business. This book is focused on solving these problems as well as providing best practices and performance-enhancing techniques. This edition is fully updated to include all the new features in version 6.5 as well as the latest tools and techniques to keep vSphere performing at its best. This book starts with interesting recipes, such as the interaction of vSphere 6.5 components with physical layers such as CPU, memory, and networking. Then we focus on DRS, resource control design, and vSphere cluster design. Next, you’ll learn about storage performance design and how it works with VMware vSphere 6.5. Moving on, you will learn about the two types of vCenter installation and the benefits of each. Lastly, the book covers performance tools that help you get the most out of your vSphere installation. By the end of this book, you will be able to identify, diagnose, and troubleshoot operational faults and critical performance issues in vSphere 6.5.
Table of Contents (17 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Using resource pool guidelines


ESXi provides several mechanisms to configure and adjust the allocation of CPU and memory resources to VMs. Thus, resource management configurations have a significant impact on VM performance.

If you expect flexibility in the total available resources, then use shares, not reservations. It will allocate resources fairly across the VMs. Even if you upgrade your hardware, each VM will stay at the same relative priority, using shares. The relative priority remains the same even though each share represents a larger amount of memory or CPU.

Remember that shares will only be effective in the case of resource contention. So, if you think you can have an immediate effect on the resources of a VM by increasing the number of shares, you are mistaken. Share values are used in order to determine the dynamic entitlement of a VM. Dynamic entitlement is used in order to determine fairness and also opportunistically distribute unused resources. Therefore, while shares are...