Red Hat DEVICE-MAPPER MULTIPATH 5.2 Bedienungsanleitung PDF herunterladen (Seite 4)

DotHill – Linux Device Mapper Multipath “How To” for Storage Revision 4

1 Scope

Device Mapper Multipath (DM-MP) allows Linux systems running a 2.6 kernel version to route

I/O over multiple paths to a storage array. DM-MP directs the I/O operations over all the usable

paths as paths fail and are repaired without any interruption to the application layer.

This document explains how to configure DM-MP for Dot Hill SANnet II storage arrays and

R/Evolution storage arrays with the following versions of Linux: Red Hat Enterprise Linux 4,

RedHat Enterprise Linux 5, Novell SUSE 9 and Novell SUSE 10.

2 Quick Start

This section contains a concise description of the steps necessary to set up DM-MP for the SAN-

net II FC, SANnet II SATA or R/Evolution storage arrays. Experienced Linux systems

administrator are invited to dive right in. Others can use it as an overview of the configuration

process.

1. Install the DM-MP package if it is not already installed.

(See “ Installing DM-MP”)

2. By default all devices are blacklisted (disqualified from control by DM-MP). Comment out

or delete the following three lines that appear near the beginning of the

/etc/multipath.conf file:

# devnode_blacklist {

# devnode "*"

# }

3. Edit the devices section of the /etc/multipath.conf file to look like the following (two

examples of DotHill storage are shown):

Example #1:

devices {

device {

vendor "DotHill"

product "SANnet II FC"

path_grouping_policy multibus

getuid_callout "/sbin/scsi_id -g -u -s /block/%n"

}

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Bedienungsanleitung Seite 4