setting CPU entitlement for AIX 6.1

Question

Hi I would like to understand LPAR entitlement's better.

If I have a system that is running AIX 6.1 with an uncapped LPAR, what do I lose by setting the entitlement low? Meaning theoretically if I need more CPU power and more CPU's are available then I should see additional Lpars unfold and get more power, does this unfolding cause a system performance hit?

Is there a formula for setting CPU entitlement for AIX 6.1?

Answer 1

I know understand the issue. Its more than just requesting extra resources

any capacity used beyond an LPAR's entitled capacity isn’t guaranteed (as it might be some other LPAR's entitlement)

Meaning that you can be forced down to 100% use when you really need more. Lesson: Don't get your entitlement wrong.

http://www.ibmsystemsmag.com/aix/Micro-Partitioning_on_AIX/32920p1.aspx