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vSphere Availability Guide ESX 4.1
vSphere Availability Guide
ESX 4.1
ESXi 4.1
vCenter Server 4.1
This document supports the version of each product listed and
supports all subsequent versions until the document is replaced
by a new edition. To check for more recent editions of this
EN-000316-01
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vSphere Availability Guide
You can find the most up-to-date technical documentation on the VMware Web site at:
The VMware Web site also provides the latest product updates.
If you have comments about this documentation, submit your feedback to:
Copyright © 2009–2011 VMware, Inc. All rights reserved. This product is protected by U.S. and international copyright and
intellectual property laws. VMware products are covered by one or more patents listed at
VMware is a registered trademark or trademark of VMware, Inc. in the United States and/or other jurisdictions. All other marks
and names mentioned herein may be trademarks of their respective companies.
VMware, Inc.
3401 Hillview Ave.
Palo Alto, CA 94304
www.vmware.com
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Contents
Updated Information 5
About This Book 7
1 Business Continuity and Minimizing Downtime 9
Reducing Planned Downtime 9
Preventing Unplanned Downtime 10
VMware HA Provides Rapid Recovery from Outages 10
VMware Fault Tolerance Provides Continuous Availability 11
2 Creating and Using VMware HA Clusters 13
How VMware HA Works 13
VMware HA Admission Control 15
VMware HA Checklist 21
Creating a VMware HA Cluster 22
Customizing VMware HA Behavior 26
Best Practices for VMware HA Clusters 28
3 Providing Fault Tolerance for Virtual Machines 33
How Fault Tolerance Works 33
Using Fault Tolerance with DRS 34
Fault Tolerance Use Cases 35
Fault Tolerance Checklist 35
Fault Tolerance Interoperability 37
Preparing Your Cluster and Hosts for Fault Tolerance 38
Providing Fault Tolerance for Virtual Machines 41
Viewing Information About Fault Tolerant Virtual Machines 43
Fault Tolerance Best Practices 45
VMware Fault Tolerance Configuration Recommendations 47
Troubleshooting Fault Tolerance 48
Appendix: Fault Tolerance Error Messages 51
Index 57
VMware, Inc.
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vSphere Availability Guide
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VMware, Inc.
Updated Information
This vSphere Availability Guide is updated with each release of the product or when necessary.
This table pro vides the update history of the vSphere Availabiility Guide .
Revision Description
EN-000316-01 Edited note in “Creating a VMware HA Cluster,” on page 22 to indicate that automatic startup is not
supported when used with VMware HA.
EN-000316-00 Initial release.
VMware, Inc.
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