On Fri, 18 Jul 2014 10:53:55 -0500, Joel C. Ewing wrote: >On 07/18/2014 09:53 AM, Tim Deller wrote: >> From DFSMS Using Data Sets >> >> System-determined block size: The system can derive the best block size for >> DASD, tape, and spooled data sets. The system does not derive a block size >> for BDAM, old, or unmovable data sets, or when the RECFM is U. > >Which would imply that for a RECFM=U data set, if you don't explicitly specify >a BLKSIZE value via the DCB or DD when the data set is created, there would be >no way the VTOC could have saved a value for it. Perhaps that is the reason >only 0 is seen after the OPEN? > ISTR hearing that for RECFM=U, SDB selects 32760.
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