The appropriate tool for resizing structures during a migration from one 
CFLevel to another is the SIZER utility, which is distinct from CFSizer.  SIZER 
uses the IXLMG and IXCQUERY APIs to collect structure attribute and count 
information from all allocated structures, and then uses the IXLCSP API to 
direct structure size computation requests based on that collected information 
to all CFs connected to the system from which it is running.  You can download 
the SIZER package, containing the executable, linkedit JCL, execution JCL, and 
a user guide, from the CFSizer alternate sizing techniques page at 
https://www.ibm.com/support/pages/cfsizer-alternate-sizing-techniques.  The 
utility runs as a batch job or started task.  The documentation explains the 
use case, procedure for use, and interpretation of the results.  Read it 
carefully before running the utility.  Note in particular that for SIZER to be 
helpful during migration, you must run it when both old and new CFs are 
installed in the sysplex.

Bill Neiman
IBM Parallel Sysplex Development

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