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vSphere High Performance Cookbook

You're reading from vSphere High Performance Cookbook A cookbook is the ideal way to learn a tool as complex as vSphere. Through experiencing the real-world recipes in this tutorial you'll gain deep insight into vSphere's unique attributes and reach a high level of proficiency.

Product type Paperback

Published in Jul 2013

Publisher Packt

ISBN-13 9781782170006

Length 240 pages

Edition 1st Edition

Languages

C

Tools

vSphere

Concepts

High Performance Programming

Author (1):

Prasenjit Sarkar

View More author details

Table of Contents (15) Chapters

vSphere High Performance Cookbook

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

1. CPU Performance Design

2. Memory Performance Design FREE CHAPTER

3. Networking Performance Design

4. DRS, SDRS, and Resource Control Design

5. vSphere Cluster Design

6. Storage Performance Design

7. Designing vCenter and vCenter Database for Best Performance

8. Virtual Machine and Application Performance Design

Index

Using VM Monitoring

When you enable VM Monitoring, the VM Monitoring service, which is serviced by VMware Tools, evaluates whether each virtual machine in the cluster is running or not. Regular heartbeats and I/O activity from the VMware Tools process will be checked by the VM Monitoring service to determine the running guest.

Sometimes, VM heartbeats or I/O activity are not received by the VM Monitoring Service because the guest operating system has failed or VMware Tools is not being allocated time to complete its tasks. If the VM Monitoring Service does not get to listen to those heartbeats, then it declares that the virtual machine has failed and the virtual machine is rebooted to restore service.

The VM Monitoring service also monitors a virtual machine's I/O activity just to avoid unnecessary resets. If there are no heartbeats received within the failure interval, the I/O stats interval (a cluster level attribute) is checked. The I/O stats interval (by default 120 seconds) determines...

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