As Peter points out, the Sizer utility, rather than CFSizer, is the tool of choice for resizing structures in anticipation of a CFLEVEL change. CFSizer (https://www-01.ibm.com/support/docview.wss?uid=isg3T1027062) is appropriate when you're introducing a new workload or changing a workload for an existing structure-exploiting application. Sizer (downloaded from the CFSizer alternate sizing techniques page https://www-01.ibm.com/support/docview.wss?uid=isg3T1025939) is what you want to use when you're upgrading a CF and you're satisfied that your existing structures are adequately sized for their current workload. The Sizer download package contains documentation describing its usage and output. Note in particular that to use Sizer there must be a point in your upgrade process when you have both up-level and down-level CFs connected to some system in the sysplex.
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