The theoretical worst case for a TSO pack is that every track on the volume could be a single-track data set, except for the following: volume label track, VTOC, VTOC index, and VVDS. And each such single-track data set would need at least one DSCB (Format 1) record in the VTOC, and you can only get about 50 of them on each VTOC track.
Bill Fairchild ----- Original Message ----- From: "Ed Gould" <edgould1...@comcast.net> To: IBM-MAIN@LISTSERV.UA.EDU Sent: Thursday, February 6, 2014 1:44:08 PM Subject: Re: Implicit VVDS creation Doug: Any TSO pack is a mandatory larger VTOC and a larger VVDS. A *LONG* time ago I had a TSO pack that needed a 5 cylinder vtoc. I don't expect that has changed and if SMS managed a larger than typical VVDS as well. Ed On Feb 6, 2014, at 1:31 PM, Doug Fuerst wrote: > It's true, but I get alot of datasets in a small VTOC too. I can't > actually recall ever having to allocate a VVDS except for a very > special situation. > > Doug > > Doug Fuerst > BK Associates > 718.921.2620 > 917.572.7364 > d...@bkassociates.net > > > > ------ Original Message ------ > From: "Ed Gould" <edgould1...@comcast.net> > To: IBM-MAIN@listserv.ua.edu > Sent: 2/6/2014 1:47:17 PM > Subject: Re: Implicit VVDS creation > >> Doug: >> >> Somewhere along the line I though SMS datasets requires an entry >> for each one. >> >> Ed >> On Feb 6, 2014, at 12:25 PM, Doug Fuerst wrote: >> >>> You have that many VSAM datsets on a volume? >>> 10 tracks holds a fair amount of data for a VVDS. >>> >>> Doug >>> >>> Doug Fuerst >>> BK Associates >>> 718.921.2620 >>> 917.572.7364 >>> d...@bkassociates.net >>> >>> >>> >>> ------ Original Message ------ >>> From: "David G. Schlecht" <dschle...@admin.nv.gov> >>> To: IBM-MAIN@listserv.ua.edu >>> Sent: 2/6/2014 12:55:12 PM >>> Subject: Re: Implicit VVDS creation >>> >>>> Hold the presses! The documents for v1r13 say the VVDSSIZE >>>> defaults to TRKS(10 10). Holy cow, that's a whole lot less than >>>> 10 cylinders. >>>> >>>> One would think that at 10 tracks, the VVDS would run out of >>>> space (and extents) quite frequently but I don't see this being >>>> a frequent topic on IBM-MAIN. >>>> >>>> >>>> snip>>> >>> >>> -------------------------------------------------------------------- >>> -- >>> For IBM-MAIN subscribe / signoff / archive access instructions, >>> send email to lists...@listserv.ua.edu with the message: INFO IBM- >>> MAIN >> >> --------------------------------------------------------------------- >> - >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to lists...@listserv.ua.edu with the message: INFO IBM- >> MAIN >> >> > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
