A practical way to do an estimate of DDF eligible work is the following:

a) evaluate the amount of CPU used by DDF work running on DRDA and TCP/IP in the peak hours b) evaluate the amount of CPU used by DDF work running stored procedures in the same hours
c) eligible work = (a - b) * ,5

The information required to estimate a and b are in SMF 101.
The ,5 coefficient is what I found is "permitted" to go on zIIP.

Remember that, if you have many GCP and few zIIPs, some of the eligible work (about 10% if zIIPs are not overloaded) will continue to run on GCP.

Hope this helps
Fabio

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