I thought there was a minimum of 18 bytes for LRECL. At least, there was in 1981, when I learned JCL. - Ted MacNEIL eamacn...@yahoo.ca Twitter: @TedMacNEIL
-----Original Message----- From: Paul Gilmartin <paulgboul...@aim.com> Sender: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> Date: Wed, 17 Aug 2011 19:43:19 To: <IBM-MAIN@bama.ua.edu> Reply-To: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> Subject: Re: ABEND - 637-04 On Wed, 17 Aug 2011 09:17:40 -0700, Ed Gould wrote: A 32K blocksize is not optimal for 3390 . IIRC it would be 1 block per track (track size being 48K) Half track blocking or 24K is probably the best, IMO. My memory is drawing a blank for 3380 (but 36K maybe right) so 18K. Best to use blksize=0 unless the damn program over rides the blocksize, if so call the vendor. And if the vendor happens to be IBM? ... I believe there remain some IBM utilities that usurp SDB. Some of these have been fixed, perhaps by APAR, sometimes exposing errors in SDB. It's bigger than 24K for 3390. Experiment shows 27998. It's in a book somewhere. another publication recommends, "see IBM 3390 Direct Access Storage Subsystem Reference," but I can't find that on publibz today. BTW, I misstated the condition in my riddle earlier: "... what is the smallest block size that SDB will ever choose on a 3390?" Of course, for RECFM=F,LRECL=1, SDB will choose 1. But that's trivially uninteresting. I meant to say, "What is the smallest block size that SDB will choose on a 3390 for a blocked RECFM such as VB or FB (or perhaps U)?" The answer may be surprising at first. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
