Matthew, are you talking about the z/OSMF user data, mounted on /global/zosmf/? That is not a data set which is shipped with z/OS 3.1. That data set contains your user data from your z/OSMF server, so on z/OS 3.1 you should carry forward your data set from your z/OS 2.5 server. I believe there is an optional step in the Post_Deploy workflow to create a new empty data set, but that's not typically what you want if you have an existing data set from a prior release.
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Kurt Quackenbush
IBM, z/OS SMP/E and z/OSMF Software Management
kurtq@us.ibm.com------------------------------