AIX Tip of the Week

Enabling CPU Deallocation

Audience: System Administrators

Date: January 7, 2002

AIX's "CPU Deallocation" can enhance SMP availability by dynamically taking a failing CPU offline. However, "CPU Deallocation" is not enabled by default. To enable, use smit or the command

chdev -l sys0 -a cpuguard='enable'

To verify it has been enabled, run the command:

lsattr -El sys0

Note: CPUguard requires a minimum of three CPU's.

You can use the cpu_deallocate command to dynamically turn off a processor. See the AIX Tip cpu_deallocate for more information.

Bruce Spencer,