It is my understanding that the ALLOC should not step if you have SPACE coded in your JCL. By default you should get your space request, though it might be in more than one extent (up to 5). Now if you have some 3rd party software installed it might be stepping in to prevent the initial X37 abend on allocation. I don't recall if you could code something in the ACS routines to step in to adjust the primary allocation.
Thanks.. Paul Feller AGT Mainframe Technical Support -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Elardus Engelbrecht Sent: Monday, March 04, 2019 6:33 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Disk space allocation question [EXTERNAL] Sean Gleann wrote: >Does z/OS / SMS have a set of default space allocation sizes and if so, where >are they held and can I alter or control them? Look in ALLOCxx as kindly suggested by Roger Lowe. If you know what SMS routines were used, look at their definitions. >I have a situation where insufficient contiguous disk space results in the >SPACE request parameters supplied for a DISP=(NEW...) file with values that >are too low to fulfil the final requirements. >Example: I request SPACE=(TRK,(9000,1000)… and what I get is >...TRK,(7200,500), which eventually leads to a B37 abend. Please post that full B37 abend message. There may be another reason why you are not getting what you want. What about trying to use more than one volser for your allocation attempts? >It's that 'eventually' bit that is most disheartening. I would far rather have >the space request completely refused along with a job abend rather than have >the system 'try to help' me. Buy more disks... ;-) Pre-allocations may help before you actually use it, but of course, how do you know what size is 'correct'? Groete / Greetings Elardus Engelbrecht ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- Please note: This message originated outside your organization. Please use caution when opening links or attachments. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
