With system-managed (SMStape), we SMS-manage the tape libraries and tape volumes and we do not manage the datasets on the tape volume (we leave this up to the tape management system and the application that owns the data). And though we use an ICF catalog for our meta data (tape volume and tape library-related information) we do not require that the tape datasets on an SMS-managed volume be cataloged. This is where we differ from SMS-managed disk where the datasets are cataloged. And with SMS-managed tape, the ACS routines and constructs are then used to manage the tape volumes and tape libraries.
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