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question about processing units on IVM

Posted on 2011-10-01
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Last Modified: 2013-11-17
ok, we're migrating some LPARs AIX 5.3 to our PS700 bladecenter. After the lpar has been migrated I see it does not uses more Processing Units than Assigned. See

 processing units
Question:
Why doesn't this lpar uses more than 2 processing units when the maximum is 4?
AS you see, this lpar is alone on this blade.

Thanks.
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Question by:sminfo
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woolmilkporc earned 500 total points
ID: 36897946
Hi Israel,

isn't it late in the evening in Andorra now? Still working?

Anyway, an LPAR (Bladecenter or not, IVM or HMC controlled)
can never use more processing units than it has virtual processors configured.

And the actual number of processing units or processors is always the "Assigned" value.
"Maximum" is meant for Dynamic LPAR management, where "Dynamic" just means
that you can change the "Assigned" value while the LPAR is up and running, no need for a reboot.

"Dynamic" here is not an automatic adjustment of values above "Assigned".

The micropartitioning mechanism with really dynamic processing unit distribution
only works between the "Minimum and "Assigned" virtual processor values.

And, to repeat the most important thing: An LPAR can't use more real processing units
than virtual processors!

Try it. Raise the processing units to 4 and you will see that nothing changes.
Only if you additionally raise the number of virtual processors to four you will see that the LPAR now uses 4 CPUs.

By the way, if you set an Uncapped Weight other than "None" it will even use these four CPUs if you leave virtual porcessors at 4 but lower the number of processing units, as long as contention allows.
If the weight is "None" as in your case however, the LPAR will never get more processing units than the assigned value, regardless of the number of virtual processors.

Note: Since IVM doesn't use profiles changes you make here will persist across reboots.

wmp



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Author Closing Comment

by:sminfo
ID: 36897991
jee

yes my friend! working yet migrating some AIXs to the new hardware..

So, reading your post I thing we're in troubles because we MUST set two virtual CPU because of a software license our client has.. let me see if we can by another license to 4 CPUs...

Thanks!!

Go home now! I'm very very tired..
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Expert Comment

by:woolmilkporc
ID: 36898004
Thx for the points and Good Night.

Have a nice Sunday!

Le wmp
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