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

Monitoring command queuing


There are metrics for monitoring the number of active disk commands and the number of disk commands that are queued. These metrics provide information about your disk performance. They are often used to further interpret the latency values that you might be observing.

The number of active commands: This metric represents the number of I/O operations that are currently active. This includes operations for which the host is processing. This metric can serve as a quick view of storage activity. If the value of this metric is close to or zero, the storage subsystem is not used. If the value is a non-zero number, sustained over time, then constant interaction with the storage subsystem takes place.

The number of commands queued: This metric represents the number of I/O operations that require processing but have not yet been addressed. Commands are queued and waiting to be managed by the kernel when the driver's active command buffer is full. Occasionally, a queue will...