Jesse 1 Robinson wrote:
Just keep in mind that AFAIK opening a PDSE still requires SMS to be active. 
That means that certain libraries opened very early in IPL must still be 
standard PO.

I don't recall whether SMS must be active to open a PDSE (managed or not), but the reason why you can't use PDSEs early in IPL processing (think "parmlib concatenation or LPA list") is more prosaic. Much of the code needed to process PDSEs lives in LPA. Until CLPA is done, they cannot be opened.

John Eells
IBM Poughkeepsie

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