Hi List, 

I have a question about what we recently experienced when dealing with 
Defined Capacity changes. Say I have a production LPAR with a defined 
capacity of 100 and a tech-only LPAR with 10. Management decides that we 
can afford an extra 2 MSU, temporarily. So I enter Change LPAR Controls 
and change the production LPAR's Defined Capacity to 102 and a tech-only 
LPAR to 8. At this point, I click the Change Running System button to 
apply the change.

A few days later, the tech-only LPAR was re-IPL'd using a custom group 
with a load profile. The IPL was performed by selecting Activate. We 
notice at this point that the tech-only LPAR's Defined Capacity was set to 
10. We promptly changed it back to 8.

Then, to test this situation again, I started with a baseline of 
production=100 and tech-only=5.  I entered Change LPAR Controls again and 
changed the tech-only to 8 and again clicked on Change Running System. 
This time, when the IPL was performed via an activate, the LPAR came up 
with a defined capacity of 8.

I've found some conflicting documentation on the Google:

http://www-01.ibm.com/support/docview.wss?uid=tss1wp102437&aid=1
This page says that Change Running System changes are lost after a POR

http://www-01.ibm.com/support/docview.wss?uid=isg209611e17c3b8d419852573f700645d4d&aid=1
This page says that it's lost after a reactivation of a partition

It seems that PR/SM selects the highest Defined Capacity between the 
Running System and what's saved in the Activation profile for the LPAR. 
Can anyone shed some light as to how PR/SM actually works?

Andrew Arentsen
Senior Mainframe Systems Engineer
Phone: 800.242.7666 x1349

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