>HSA is currently at 128mb. All main is allocated, no slop anywhere. If HSA 
>grows, then I'll lose an LPAR. 

128MB is nothing for HSA, these days.
If you are so tight that an increase to such a small HSA is an issue, you have 
a bigger problem than the size of HSA!

At $10K/GiB, what are you waiting for.

These days, I would plan for a minimum of 1GB HSA, and a minimum of 3 per LPAR.
More if it's doing real work (DB2, IMS, or CICS).

The overhead due to paging is more expensive than the memory.
When in doubt.
PANIC!!    

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