Using Device-Mapper Multipath

Using Device-Mapper Multipath

Configuration and Administration

Copyright © 2008 Red Hat, Inc.

Legal Notice

July 2008

Abstract

This book provides information on using the Device-Mapper Multipath feature of Red Hat Enterprise Linux 5.2

Preface
1. Audience
2. Related Documentation
3. Feedback
4. Document Conventions
1. Device Mapper Multipathing
1.1. Overview of DM-Multipath
1.2. Storage Array Support
1.3. DM-Multipath Components
1.4. DM-Multipath Setup Overview
2. Multipath Devices
2.1. Multipath Device Identifiers
2.2. Consistent Multipath Device Names in a Cluster
2.3. Multipath Device Attributes
2.4. Multipath Devices in Logical Volumes
3. Setting Up DM-Multipath
3.1. Setting Up DM-Multipath
3.2. Ignoring Local Disks when Generating Multipath Devices
3.3. Adding Devices to the Multipathing Database
4. The DM-Multipath Configuration File
4.1. Configuration File Overview
4.2. Configuration File Blacklist
4.2.1. Blacklisting by WWID
4.2.2. Blacklisting By Device Name
4.2.3. Blacklisting By Device Type
4.2.4. Blacklist Exceptions
4.3. Configuration File Defaults
4.4. Multipaths Device Configuration Attributes
4.5. Configuration File Devices
5. DM-Multipath Administration and Troubleshooting
5.1. Multipath Command Output
5.2. Multipath Queries with multipath Command
5.3. Multipath Command Options
5.4. Determining Device Mapper Entries with the dmsetup Command
5.5. Troubleshooting with the multipathd Interactive Console
Index