Rex, The dsn is multi-volume and growing along with fragmentation. This is why we like to define the file with a large primary about 7,000+ so as to avoid extents.
-------------------------------------------- On Wed, 10/22/14, Pommier, Rex <rpomm...@sfgmembers.com> wrote: Subject: Re: QUESTION ABOUT VSAM / VSAM EXTENDED To: IBM-MAIN@LISTSERV.UA.EDU Received: Wednesday, October 22, 2014, 10:06 AM Willie, Just gleaning from the various replies on the list (without actually doing any research of my own), the answer is "it depends" - are you looking at a single volume VSAM dataset? If so, I believe the 65536 track (about 4369 cylinders) is the max - nothing to do with the fact that it is VSAM, just the limit of tracks on a volume - well under the 4 GB (or GiB) limit. If you are looking at a multi-volume dataset, it depends on your CI size and the accompanying physical block size of the dataset which changes the amount of data that can fit on a single track or cylinder. Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of willie bunter Sent: Wednesday, October 22, 2014 8:35 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: QUESTION ABOUT VSAM / VSAM EXTENDED Thanks to everybody's input. However, I still don't have a firm answer. What is the maximum amount of cylinders should I be able to allocate for a VSAM DSN without having to make it EXTENDED. Would this be the same critera for OAM dsns as well? -------------------------------------------- On Wed, 10/22/14, Roberto <baro...@tin.it> wrote: Subject: Re: QUESTION ABOUT VSAM / VSAM EXTENDED To: IBM-MAIN@LISTSERV.UA.EDU Received: Wednesday, October 22, 2014, 9:09 AM Hi to every, NO! A VSAM with CIsize of 4096 can use only 12 block on every tracks so in a cyls is possible to write 4096*12*15 => 737.280 byte or 720KB 4GB are 4294967296 byte / 737280 are about 5825 cyls (or 87381 tracks) Remember the space limit of 65536 track on every volume for any dsn not in extended format. (about 4369 cyls) I hope this clarify some requirement of VSAM on dasd Best Regards Roberto Il 22/10/2014 14:40, Chase, John ha scritto: >> -----Original Message----- >> From: IBM Mainframe Discussion List On Behalf Of John Eells >> >>> What is the maximum number of cyclinders that can be used to define a dsn that is not VSAM EXTENDED. >> I think it is 4400 cylinders. I was trying to allocate a dsn at 4500 4500 but I kept on abending with >> IGD17273I ALLOCATION HAS FAILED FOR ALL VOLUMES........ >>> Finally I was able to allocate the dsn at CYL(4350 4350). >> z/OS DFSMS Using Data Sets documents maximum data set sizes, including limits for both extended format >> and nonextended format VSAM data sets, in Topic 1.3.2.3. It says that nonextended VSAM data sets have >> a limit of 4GB*. >> >> (4GB* / 56664 / 15) = 5,053 cylinders (approximately) >> >> [ snip ] >> >> * I believe that is most likely GiB for the pedantic among us. > IIRC, DASD capacities are expressed in decimal, rather than binary, quantities: > > 4KB = 4,000 bytes; > 4MB = 4,000,000 bytes; > 4GB = 4,000,000,000 bytes; > Etc. > > -jc- > > ********************************************************************** > Information contained in this e-mail message and in any attachments thereto is confidential. 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