Disabling Acpi Soft-Off With Chkconfig Management - Red Hat ENTERPRISE LINUX 4 - ADMINISTRATION Manual

relying on the operating system to turn off the node; therefore, the fence device turns off
the node in a time span much longer than four to five seconds.
To disable ACPI Soft-Off, use chkconfig management and verify that the node turns off immediately
when fenced. The preferred way to disable ACPI Soft-Off is with chkconfig management: however,
if that method is not satisfactory for your cluster, you can disable ACPI Soft-Off with one of the
following alternate methods:
• Changing the BIOS setting to "instant-off" or an equivalent setting that turns off the node without
delay
Note
Disabling ACPI Soft-Off with the BIOS may not be possible with some computers.
• Appending acpi=off to the kernel boot command line of the /boot/grub/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.
The following sections provide procedures for the preferred method and alternate methods of disabling
ACPI Soft-Off:
Section 2.3.1, "Disabling ACPI Soft-Off with chkconfig Management"
•
Section 2.3.2, "Disabling ACPI Soft-Off with the BIOS"
•
Section 2.3.3, "Disabling ACPI Completely in the grub.conf File"
•

2.3.1. Disabling ACPI Soft-Off with chkconfig Management

You can use chkconfig management to disable ACPI Soft-Off either by removing the ACPI daemon
(acpid) from chkconfig management or by turning off acpid.
Note
This is the preferred method of disabling ACPI Soft-Off.
Disable ACPI Soft-Off with chkconfig management at each cluster node as follows:
1. Run either of the following commands:
• chkconfig --del acpid — This command removes acpid from chkconfig management.
— OR —
Disabling ACPI Soft-Off with chkconfig Management
— Preferred method
— First alternate method
— Second alternate method
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