On Tue, 28 Aug 2012 15:33:15 -0500, Richard Peurifoy wrote: >> >> But for CKD doesn't there have to be some place to write the EOF? > >I think BSAM/QSAM will simulate an EOF without doing any I/O >to the data set if you try to read it. > Yup. As I said here lately, I've depended on that behavior in the past. And I believe that if the primary extent is exactly filled, the OS will not allocate a secondary merely to write that EOF.
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