On Fri, 13 May 2022 12:33:20 +0000, Seymour J Metz wrote: >IEFBR14 does not allocate anything. The Initiator physically allocates a new >DASD dataset before invoking the jobstep program, ... > Is that a valuable clarification (despite having been stated here repeatedly) or needless pedantry, your specialty. "allocating datasets via IEFBR14" is clear enough. . "Allocating datasets via DDNAMEs which are never opened" would be marginally better.
>so it is already there when IEFBR14 gets control. For non-SMS, the VTOC will >have been updated but not the catalog; for SMS datasets, the catalog is >updated at the same time as the VTOC.. > >OPEN output for a new non-SMS dataset will allocate an extent for the EOF if >the primary extent is zero (cylinders|tracks). > That's an interesting question. I understand that if WRITE fills an extent, no secondary will be allocated merely to hold the EOF which would be necessary if additional extents existed. Is this true for OPEN; CLOSE with no intervening WRITE? Is it true even for a primary extent of zero? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
