I'm not sure how this interacts with the SMS limit on VIO, but we once experienced a near system meltdown from TSO TRANSMIT of a large file. There's a parameter in the TRANSREC entry in SYS1.PARMLIB(IKJTSO00) to control use of VIO. The pertinent keyword is VIO(xxx), which if defaulted (at least at that time) allowed the use of VIO for the XMIT temporary data set. We now specify VIO(SYSALLDA), which pushes the temporary file to real DASD.
. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-302-7535 Office [email protected] -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Martin Packer Sent: Friday, May 20, 2016 11:39 AM To: [email protected] Subject: (External):Re: What was a 3314? (was: Whither VIO) The "all 16 extents" applies to VIOMAXSIZE calculation, by the way. Cheers, Martin Sent from my iPad > On 20 May 2016, at 17:26, Paul Gilmartin <[email protected]> wrote: > >> On 2016-05-19, at 15:04, Longabaugh, Robert E wrote: >> >> ... Also VIO would get all 16 extents at once, so saying TRK(1,1) >> was not better than saying TRK(16). When a job did the VIO allocation, it got the page slots. >> > Perhaps not quite. My experience is that it gets the page slot as > each page > is accessed. Thereby hangs a tale. > > I had a job that passed a temp DS I had overallocated as CYL(0,large); primary > 0 to circumvent the then behavior of reading residual data if the DS > was never > written; EODAD was entered at end-of-extent. > > Then I tried UNIT=VIO. Worked fine and only page slots actually > written were > allocated. Until once when the first step didn't open it for output. > In the > second step, VIO read every slot looking for EOF. Page storage exhaused. > For everybody. Ouch! > > -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
