README v2.01 for Red Hat Enterprise Linux Server 5.0 DM-MPIO Configuration file for IBM Storage Sept 19, 2007 ---------------------------------------------------------------------------- CONTENTS 1.0 About this README file 1.1 Who should read this README file 1.2 How to get help 2.0 Prerequisites for Multipath Configuration File 3.0 Change History 4.0 Supported IBM Storage Servers 5.0 Installation and Usage. 6.0 Notice 7.0 Trademarks and service marks ----------------------------------------------------------------------------- 1.0 About this README file This README file contains the most recent information about the multipath.conf configuration file for IBM storage Servers. 1.1 Who should read this README file This README file is intended for storage administrators, system programmers, and performance and capacity analysts. The information in this file only applies to customers who run: 1. IBM TotalStorage DS8000 2. IBM TotalStorage SVC 4.2 1.2 How to get help Go to the following Web site for IBM TotalStorage DS8000 support: http://www-1.ibm.com/servers/storage/disk/ds8000/index.html Go to the following Web site for IBM TotalStorage SVC support: http://www-03.ibm.com/systems/storage/software/virtualization/svc/index.html 2.0 Prerequisites for Multipath Configuration File Red Hat Enterprise Linux Server 5.0 with: - the "in-box" kernel-mode device mapper multipath module device-mapper-1.02.13-1.el5 - the "in-box" userspace multipath-tools device-mapper-multipath-0.4.7-8.el5 3.0 Change History v2.00: First version of the IBM TotalStorage DS8000 support. v2.01 Added SVC 4.2 support 4.0 Supported IBM storage Servers IBM TotalStorage DS8000, IBM TotalStorage SVC 4.2 5.0 Installation and Usage The multipath.conf file is required to create friendly names for the multipath devices that are managed by the Linux device mapper multipath module. This file describes the different parameters and also lists how to make use of other features such as how to black-list devices and create aliases. The file needs to be copied to the "/etc" directory. If this file is copied to the "/etc" directory after the device mapper multipath driver and multipath-tools daemon are started, you will have to run the "multipath" command from the command line to reload the settings from the multipath.conf file. 6.0 Notices This information was developed for products and services offered in the U.S.A. IBM may not offer the products, services,or features discussed in this document in other countries. Consult your local IBM representative for information on the products and services currently available in your area. Any reference to an IBM product, program, or service is not intended to state or imply that only that IBM product, program, or service may be used. 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