I believe that GDG model DSCBs are still a thing for non-SMS volumes. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר
________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Steve Thompson <ste...@wkyr.net> Sent: Sunday, January 7, 2024 8:16 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: allowed characters in member name Going back to hazy memories... GDGs needed the DSN specified, and the DCB info DCB=(dsn,....) so that the allocation routines would correctly set the DSCB info for the data set by getting the LRECL, RECFM, etc. so that allocation would have all that. I'm not sure that DFP V3 fixed this, or SMS or what. But I remember having to remember to do these things back in the day, for SMF tapes and the like, when doing the initial allocation for a GDG generation data set (GDS) (+1, etc.). Steve Thompson On 1/7/2024 5:15 PM, Paul Gilmartin wrote: > On Sun, 7 Jan 2024 21:50:07 +0000, Gibney, Dave wrote: > >> DCB for the subparameters as been depreciated and, in my opinion, bad form >> for most of the 40 years I worked on mainframes. The DCB=modeldscb form used >> for new GDS allocations hasn't been needed since SMS came along. Early 90s'? >> I may recall wrong, but I think LIKE was new with SMS. >> > Formerly needed; now deprecated. Why was it ever needed? I suspect the > change > was less to accommodate SMS than UNIX files, which support attributes but no > DCB. > > Answering my earlier question (IRTFM): > <https://www.ibm.com/docs/en/zos/3.1.0?topic=parameter-examples-like> > Example 2 > //SMSDS7 DD DSNAME=MYDS7.PGM,LIKE=MYDSCAT.PGM,DISP=(NEW,KEEP), > // LRECL=1024 > In the example, the data set attributes used for MYDS7.PGM are obtained > from > the cataloged model data set MYDSCAT.PGM. Also, the logical record > length of > 1024 overrides the logical record length obtained from the model data > set. > ---------------------------------------------------------------------- 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
