On Fri, 18 Jul 2014 13:23:29 -0400, John Eells wrote: >Paul Gilmartin wrote: >> ISTR hearing that for RECFM=U, SDB selects 32760. > >You might have heard that, but it does not match my recollection; and, >on our internal z/OS V2.1 system, tests with both ISPF OPT3.2 and JCL >show a resulting block size of zero if one is not specified for RECFM=U.
And it disagrees with the book. In Using Data Sets, topic 3.2.3.1.2 System-Determined Block Size, there is this: <quote> The system does not determine the block size for the following types of data sets: - Unmovable data sets - Data sets with a record format of U - Existing data sets with DISP=OLD (data sets being opened with the INPUT, OUTPUT, or UPDAT options on the OPEN macro) - Direct data sets - When extending data sets </quote> AFAIK, the DATACLAS ACS routine could set it, though. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
