You have a set of datasets accessed via Fileshare server server1. They are in c:\fsdir\datasets, where c:\fsdir is the Fileshare directory for server1. You move the datasets to c:\fs2dir\data, where c:\fs2dir is the Fileshare directory for server2. In future you want to access them via server2. To update the catalog:
set mfsyscat=c:\catalog\catalog.dat set mfalloc_loc=$$server1\datasets mvspcrn $$server1\datasets $$server2\data