3.5. Configuring ACPI For Use with Integrated Fence Devices
shutdown -h now). Otherwise, if ACPI Soft-Off is enabled, an integrated fence device can take four or more seconds to turn off a node (refer to note that follows). In addition, if ACPI Soft-Off is enabled and a node panics or freezes during shutdown, an integrated fence device may not be able to turn off the node. Under those circumstances, fencing is delayed or unsuccessful. Consequently, when a node is fenced with an integrated fence device and ACPI Soft-Off is enabled, a cluster recovers slowly or requires administrative intervention to recover.
chkconfigmanagement and verify that the node turns off immediately when fenced. The preferred way to disable ACPI Soft-Off is with
chkconfigmanagement: 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
NoteDisabling ACPI Soft-Off with the BIOS may not be possible with some computers.
acpi=offto the kernel boot command line of the
ImportantThis 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.
- Section 3.5.1, “Disabling ACPI Soft-Off with
chkconfigManagement” — Preferred method
- Section 3.5.2, “Disabling ACPI Soft-Off with the BIOS” — First alternate method
- Section 3.5.3, “Disabling ACPI Completely in the
grub.confFile” — Second alternate method
3.5.1. Disabling ACPI Soft-Off with
chkconfigmanagement to disable ACPI Soft-Off either by removing the ACPI daemon (
chkconfigmanagement or by turning off
chkconfigmanagement at each cluster node as follows:
- Run either of the following commands:
chkconfig --del acpid— This command removes
chkconfigmanagement.— OR —
chkconfig --level 345 acpid off— This command turns off
- Reboot the node.
- When the cluster is configured and running, verify that the node turns off immediately when fenced.
NoteYou can fence the node with the
fence_nodecommand or Conga.