At 18:28 -0500 on 08/06/2009, Paul Gilmartin wrote about Re:
Concatenations and blocksizes:
It is a misdesign that the OS allows this ever to happen. The
principal use of this facility is to correct errors that were
introduced by its earlier inadvertent use. Simply, any OPEN for
WRITE with overriding attributes where the label contains different
nonzero attributes should ABEND for inconsistent attributes.
IMO: This is (or should be) only an error if the supplied Blocksize
is SMALLER than the VTOC one. Making the Blocksize larger (so long as
it is still a multiple of the LRECL for a FB file and the RECFM is
not FBS) has no effect since the now shorter blocks will still be
read correctly. Only REDUCING the VTOC Blocksize would make
older/larger blocks unreadable.
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