Using udev to Simplify HP Serviceguard for Linux Configuration, October 2006

Special Naming for LockLUN

Serviceguard for Linux treats the LockLUN device in a special way. This places a

restriction on the types of device names that are acceptable. Only names starting with

/dev/sd or /dev/cciss are accepted for LockLUN. When using udev, the recommended

persistent names for LockLUN are /dev/sdLockLUN since CCISS devices are not

supported. Partition numbers will be added by the system.

Configuring udev

The configuration files for udev are in /etc/udev/rules.d. The udev configuration file

entries associate a physical device to a logical name based on information that uniquely

identifies the physical device. The three major steps to configuring udev for the shared

storage used by Serviceguard are:

• Obtain and install the LMP utility

• Create rules for a device

• Create links for persistence

Note that the kernel shipped with Novell SLES10 (and probably later distributions like

RedHat 5) have differences in implementation.

Obtaining and Installing the LMP Utility

HP’s LUN Persistence and Migration Utility for Linux was created to simplify migration

from SecurePath. This tool can be used to simplify creating udev entries for Serviceguard

for Linux.

1. Download the file LMPutils.tar.gz on the page “LUN Persistence and Migration Utility

for Linux”. You can access this page directly using the URL link:

http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=e

n&cc=us&prodTypeId=12169&prodSeriesId=1814938&prodNameId=1825342&swEnv

OID=2025&swLang=8&mode=2&taskId=135&swItem=co-39335-1

or you can search

www.hp.com

for the title. The version used for this white paper is dated March 2006.

2. Enter the following commands to install the hpudev-cfg package:

# tar -zxvf LMPutils.tar.gz

# cd ./LMPutils

# ./install.sh –i