I got some basic answers like BRMS has CTLGRP and you can track Tape Device, which tape has what data etc. But not that specific points by which I can get to know the real difference and more on it
A Google search for [ AS400 Architecture ] brings up many useful links. That would have been faster than asking here, and it’s unlikely that any comment here will provide more information than that. — Tom
thanks for the suggestion Tom!