Red Hat ENTERPRISE LINUX 5 - ADMINISTRATION Manual page 26

Chapter 2. Before Configuring a Red Hat Cluster
you can disable ACPI completely by appending acpi=off to the kernel boot command line in the
grub.conf file.
Important
This method completely disables ACPI; some computers do not boot correctly if ACPI is
completely disabled. Use this method only if the other methods are not effective for your
cluster.
You can disable ACPI completely by editing the grub.conf file of each cluster node as follows:
1. Open /boot/grub/grub.conf with a text editor.
2. Append acpi=off to the kernel boot command line in /boot/grub/grub.conf (refer to
Example 2.2, "Kernel Boot Command Line with acpi=off Appended to
3. Reboot the node.
4. When the cluster is configured and running, verify that the node turns off immediately when
fenced.
Note
You can fence the node with the fence_node command or Conga.
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition.
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=5
serial --unit=0 --speed=115200
terminal --timeout=5 serial console
title Red Hat Enterprise Linux Server (2.6.18-36.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-36.el5 ro root=/dev/VolGroup00/LogVol00
console=ttyS0,115200n8 acpi=off
initrd /initrd-2.6.18-36.el5.img
In this example, acpi=off has been appended to the kernel boot command line — the line starting
with "kernel /vmlinuz-2.6.18-36.el5".
Example 2.2. Kernel Boot Command Line with acpi=off Appended to It
16
It").
This means that