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

2. Edit the /etc/udev/rules.d/10-HP-Local.rules file by appending the output

of step 1 at the end of the file. Each rule should be entered as a single line. To have

the partitions represented, add “%n” to the SYMLINK string:

SYMLINK="hpdev/mylink-sda%n”

NOTE: If you add the line by redirecting the output of hp_gen_rule to

10-HP-Local.rules you must edit that file and delete the line that has the

“Note:” and all

blank lines that were added. The blank lines have non-printing

characters that cannot be interpreted by udev. Blank lines and comment lines

beginning with ‘#’ can then be added.

Creating Links for Persistence

You can create a single link or multiple links for persistence.

To create a single persistence link, enter the following command:

For RedHat 4 and SLES9:

# udevstart

For SLES10:

# udevtrigger

In some cases it may also be necessary to reboot the system running SLES10.

The links are created under the directory mentioned in the udev_root path variable that is

configured in the /etc/udev/udev.conf file. For example the link shown in step 1

(Creating rules for a device) is created as $udev_root/hpdev/mylink-sda. The

default value for $udev_root is /dev.

To create multiple links for any device, add space separated names on the corresponding

rule in the /etc/udev/rules.d/10-HP-Local.rules file. For example:

BUS="scsi", KERNEL="sd*",

RESULT="360060e80042747000000274700000315",

NAME="%k",SYMLINK="hpdev/mylink-sda%n myanotherlink-sda%n"

In this case,

myanotherlink-sda would be in the /dev directory.

Additional information about udev can be found at

http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev.html