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Is there a formula for the size of page datasets based on the size of the LPAR ?
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I dson't know of any hard-and-fast formula, but there are some guidelines in the Init & Tuning manuals.

I typically give 1/3 of a 3390-3 volume for a single paging dataset, populating the remainder of the volume with low-use datasets. I also plan on being ready to add at least two more page datasets of similar size, in case of an emergency that might arise due to shortages.

Running roughly 300 address spaces, I found that four of these page datasets was about right, with no more than 50% utilization of any one of them.

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