It seems to me that ordinary LPAR weights will do the trick. They will
allow excess capacity to be used by any/all LPARs, but enforce a max
proportional to the LPAR weight when the CEC reaches full utilization.
Set the weights proportionally and you should be good to go. 

What to do about the case where customer P is using more than his
contracted capacity is another issue entirely...



<snip>
AS I mentioned earlier, we have many LPARs and many different 
customers on the Processor complex, so white space is an issue. 
Besides, the reason to implement the group is to allow a particular 
customer on our Processor complex to use the total capacity they have 
contracted for, in the most efficient possible way. This means 
allowing then to make use of otherwise wasted spare capacity on the T 
LPAR on the P LPAR.
</snip>

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