On Thu, 18 Aug 2011 17:16:36 +0000, john gilmore wrote: >Seymour's comment about 32K BLKSIZE= values for "load libraries" needs >qualification. It is on the mark for traditional PDSs containing load >modules. It is off the mark by a factor of 8 for PDSEs containing program >objects. They have an imposed block size of 4K, which should not be/need not >be mentioned. > For PDSEs not containing program objects, the BLKSIZE in the DCB governs the appearance of the data presented to the problem program. This gives the programmer a choice between fewer READ operations or fewer I/O commands. But there is no penalty in DASD space for choosing a BLKSIZE as close to 32760 (or as small) as LRECL allows.
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