On Mon, 13 Nov 2023 01:10:14 -0600, Jon Perryman <jperr...@pacbell.net> wrote: > >>Suppose I am writing with QSAM/BSAM to a UNIX file allocated >>RECFM=FB,LRECL=80,FILEDATA=BINARY,PATH=... >>Should I specify: >>o BLKSIZE=80 for minimum latency for other jobs doing "tail -f"? > >z/OS Unix filesystems are linear datasets. Unless things have changed, BLKSIZE >is ignored. LRECL is not stored and must be specified. > No. BLKSIZE is not ignored. It is merged into the DCB by OPEN, or supplied by SDB if not otherwise specified. for BSAM it affects how many times the WRITE/CHECK is issued, and probably has some effect on performance for QSAM.
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