Scott, I may be older then.
The JCL is pretty much run of the mill placeholder allocation. It's a pretty common practice to pre-allocate your space like this. Some shops add the DCB info in the IEFBR14 and some shops add it on the step that opens the file. It doesn't really matter 'cause it is just space. We used to fill our RVAs and Icebergs with 100s of these. And it may not be obvious, but LRECL=0 is really saying LRECL is missing, just like BLKSIZE=0 which is used all the time. The JCL and ISPF 3.2 don't ask for these LRECL and BLKSIZE to be zero, it just they are displayed as zero because nothing has actually been specified. Now this may be a wild arsed guess, but I think Jason is trying to create a DATACLAS and associated rules that will provide a set of default characteristics for a DSORG=PS file. The ACS routine he provided is not working for the IEFBR14 because the DSORG is null. I'm still not certain that ISPF is opening the file as described by Ted, but I do believe that ISPF is adding DSORG=PS even though it is not requested - there's nowhere for you to actually specify the DSORG in ISPF 3.2. This is the non-SMS allocation from the JCL from the OP. . Data Set Information . . Command ===> . . . . Data Set Name . . . . : HAWKINS.CEB.TEST . . . . General Data Current Allocation . . Management class . . : **None** Allocated tracks . : 1 . . Storage class . . . : **None** Allocated extents . : 1 . . Volume serial . . . : PE1USA . . Device type . . . . : 3390 . . Data class . . . . . : **None** . . Organization . . . : NONE Current Utilization . . Record format . . . : ? Used tracks . . . . : 0 . . Record length . . . : 0 Used extents . . . : 0 . . Block size . . . . : 0 . . 1st extent tracks . : 1 . . Secondary blocks . : 10 Dates . . Data set name type : Creation date . . . : 2011/04/01 . . Referenced date . . : ***None*** . . Expiration date . . : ***None*** . Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Scott Ford > Sent: Friday, April 01, 2011 1:09 PM > To: [email protected] > Subject: Re: [IBM-MAIN] DATACLASS > > I went back and read the original post...Its not clean what > Ron, > > I went back and read the original post...Its not clean what Jason is doing, I > see the IEFBR14 and it is wrong JCL wise...but what is this dataset's > attributes > or is it being modelled after another dataset.....Maybe I am getting old > dude..I > also saw his ISPF 3.2 ...never have I allocated a dataset as LRECL = 0 > and BLKSIZE = 0 , and of > > course forget reading it ..what is he trying to do here..? > > Scott J Ford > > > > > > ________________________________ > From: Ron Hawkins <[email protected]> > To: [email protected] > Sent: Fri, April 1, 2011 2:48:55 PM > Subject: Re: DATACLASS > > Scott, > > The IEFBR14 example from the original post is one example of a program that > would allocate such a dataset. > > Ron > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of > > Scott Ford > > Sent: Friday, April 01, 2011 11:17 AM > > To: [email protected] > > Subject: Re: [IBM-MAIN] DATACLASS > > > > A lrecl = and blksize = and recfm = , IMHO i wou > > Guys: > > > > A lrecl = 0 and blksize = 0 and recfm = u , IMHO i would have thought you > need > > a > > lrecl or blksize, how many programs fo you know would allocate such a > > dataset.. > > I dont know of many... > > > > > > Scott J Ford > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] 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 [email protected] 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 [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
