Why does CA PDSMAN with IEBCOPY expand the directory of a PDS and IEBGD does not?

Document ID : KB000094750
Last Modified Date : 04/05/2018
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Introduction:
Using IEBCOPY and IEBDG IBM utilities. CA PDSMAN will expand the director of a update for a PDS when using IEBCOPY but not for IEBDG.
Question:
Why does CA PDSMAN with IEBCOPY expand the directory of a PDS and IEBGD does not?
Answer:
Why does IEBCOPY expand the directory and IEBGD does not - that's because PDSM/FASTCOPY will front-end IEBCOPY and check before starting the copy to make sure enough directory blocks are present. CA PDSMAN does not front-end IEBDG, so CA PDSMAN cannot make that check up front.