I can go to ibm.com and search for system planning tool and get several hits. However most do not work.
Search the doc for any Power 10 system for system planning tool and you'll get a page like the following:
https://www.ibm.com/docs/en/power10/9105-42A?topic=planning-system-tool
However the link provided to download the system planning tool doesn't work.
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Robert Berendt IBMChampion
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