Multipath en limux

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Red Hat Enterprise Linux 5 DM Multipath
DM Multipath Configuration and Administration

DM Multipath

Red Hat Enterprise Linux 5 DM Multipath DM Multipath Configuration and Administration Edition 3

Copyright © 2010 Red Hat, Inc. The text of and illustrations in this document are licensed by Red Hat under a Creative Commons Attribution–Share Alike 3.0 Unported license ("CC-BY-SA"). Anexplanation of CC-BY-SA is available at http://creativecommons.org/licenses/by-sa/3.0/. In accordance with CC-BY-SA, if you distribute this document or an adaptation of it, you must provide the URL for the original version. Red Hat, as the licensor of this document, waives the right to enforce, and agrees not to assert, Section 4d of CC-BY-SA to the fullest extent permitted by applicable law. Red Hat,Red Hat Enterprise Linux, the Shadowman logo, JBoss, MetaMatrix, Fedora, the Infinity Logo, and RHCE are trademarks of Red Hat, Inc., registered in the United States and other countries. Linux® is the registered trademark of Linus Torvalds in the United States and other countries. Java® is a registered trademark of Oracle and/or its affiliates. XFS® is a trademark of Silicon GraphicsInternational Corp. or its subsidiaries in the United States and/or other countries. MySQL® is a registered trademark of MySQL AB in the United States, the European Union and other countries. All other trademarks are the property of their respective owners. 1801 Varsity Drive Raleigh, NC 27606-2072 USA Phone: +1 919 754 3700 Phone: 888 733 4281 Fax: +1 919 754 3701

This book provides information on usingthe Device-Mapper Multipath feature of Red Hat Enterprise Linux 5

Preface v 1. Audience ........................................................................................................................ v 2. Related Documentation ................................................................................................... v 3. Feedback........................................................................................................................ v 4. Document Conventions ................................................................................................... vi 4.1. Typographic Conventions ..................................................................................... vi 4.2. Pull-quote Conventions........................................................................................ vii 4.3. Notes and Warnings ........................................................................................... viii 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 ............................................................................ 1 1 3 3 45 5 5 6 6

3. Setting Up DM-Multipath 7 3.1. Setting Up DM-Multipath ............................................................................................... 7 3.2. Ignoring Local Disks when Generating Multipath Devices ................................................ 8 3.3. Adding Devices to the Multipathing Database ............................................................. 10 4....
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