I may be mistaken about the RLSE or perhaps it is a function of my default DATACLAS. I know the EOF is there.
> -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On > Behalf Of David Spiegel > Sent: Wednesday, May 11, 2022 10:23 AM > To: [email protected] > Subject: Re: Potential Resource Savings Techniques > > Hi Dave, > I tested it. Your hypothesis is false (i.e. RLSE is not done.) > > Regards, > David > > On 2022-05-11 13:12, Gibney, Dave wrote: > > If SMS-managed and DSORG known, an unopened new allocation will have > an EOF set and RLSE will be process. > > > >> -----Original Message----- > >> From: IBM Mainframe Discussion List <[email protected]> On > >> Behalf Of David Spiegel > >> Sent: Wednesday, May 11, 2022 9:20 AM > >> To: [email protected] > >> Subject: Re: Potential Resource Savings Techniques > >> > >> Hi Paul, > >> Allocation does allocation and nothing but allocation. > >> It does not write anything at all. > >> > >> Regards, > >> David > >> > >> On 2022-05-11 12:17, Paul Gilmartin wrote: > >>> On Wed, 11 May 2022 15:53:20 +0000, Farley, Peter x23353 wrote: > >>> > >>>> Only if your SYSIN is not DUMMY. When SYSIN for IDCAMS is DUMMY > it > >> does (and can do) nothing at all, rather more expensively in CPU time > than > >> IEFBR14, but still nothing by comparison. > >>>> Only if you are allocating and using REPRO from a DUMMY to a new > >> sequential file or an actual DEFINE for a VSAM cluster for instance would > >> IDCAMS do what you describe. > >>> Will it not write an end-of-file at the first extent and RLSE all but > >>> the first allocation unit of SPACE? > >>> > >>> (I suspect the OP did not intend his use of "SYSIN".) > >>> > >>> In the Bad Old pre-SMS Days, I sometimes relied on a primary > >>> allocation of 0 to preclude subsequently reading residual data. > >>> > >>>> -----Original Message----- > >>>> From: <David> <Mingee> > >>>> Sent: Wednesday, May 11, 2022 11:46 AM > >>>> > >>>> IDCAMS does an open and close on the new file and writes zero > records, > >> so if RLSE is coded with the SPACE for output file(s) then the unused trks > or > >> cyls > >>>> Are released. Secondary space will be used if needed when data is > >> created in the file later. > >>>> -----Original Message----- > >>>> From: David Spiegel > >>>> Sent: Wednesday, May 11, 2022 11:07 AM > >>>> > >>>> I do not understand this at all. > >>>> How does any program differ from IEFBR14 (with respect to > >> allocation/freeing unused disk space by DD Statement)? > >>>> Maybe your shop has an Exit or add-on product which does Storage > >> Management? > >>>> On 2022-05-11 01:53, <David> <Minge > wrote: > >>>>> 5. Consider changing IEFBR14 for allocating new files to IDCAMS > with > >>>>> SYSIN DD DUMMY. This will release unused disk space. > >> ---------------------------------------------------------------------- > >> For IBM-MAIN subscribe / signoff / archive access instructions, > >> send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
