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
for more information.