Bryan,
Thanks for the reply.  Here's what the redbook says:
"Although an uncapped logical partition can use more processor power than 
its assigned
processing capacity, the uncapped logical partition can never use more 
processing units than
its assigned number of virtual processors."
If I understand that correctly, when the virtual processors and the 
physical processors are the same it will never use available processors 
from the shared processor pool.   Wouldn't the virtual processors need to 
be set to a number higher than the physical processors to make use of 
unused processor capacity? 
Also, how does increasing the number of virtual processors affect 
licensing? 
Thanks.
Mark Garton
Information Systems
O'Reilly Auto Parts
 
date: Wed, 04 Apr 2007 10:53:48 -0400
from: Bryan Dietz <bdietz400@xxxxxxxxx>
subject: Re: Dynamic LPAR - Virtual Processors
Virtual processors......they are fun to play with, aren't they.
As everyone's environment is different, I would have a look at this 
redbook:
http://www.redbooks.ibm.com/abstracts/sg248000.html?Open
Page 15 (1.3.7) starts talking about virtual processors.
a rule-of-thumb is to have the same number of virtual processors as 
there are physical processors assigned to the partition, round up if you 
  have partial processors assigned.
Bryan
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