On Wed, Sep 2, 2015 at 8:32 AM, Vernooij, CP (ITOPT1) - KLM < kees.verno...@klm.com> wrote:
> > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Paul Gilmartin > Sent: 02 September, 2015 15:23 > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: QNAMEs (was: ENQ rname_addr description) > > On Wed, 2 Sep 2015 07:17:47 -0500, John McKown wrote: > > > >> //STEP EXEC PGM=IEFBR14,COND=(0,LE) > >> //FILE DD DISP=OLD,DSN=SYS1.LINKLIB (SYS1.**, ad lib.) > >> > >A JOB with that particular DSN in it with DISP=OLD will never run. > >SYS1.LINKLIB is share enqueued by both LLA and XCFAS on a normally running > >system. > > > Understood that it will "never run". However, I believe it will linger in > an > initiator in job setup requesting ENQ EXC, thereby preventing any other > jobs' allocating that DSN. > > And tying up the initiator to boot. > > -- gil > > ---------------------------------------------------------------------- > > No JCL needs to and should allocate SYS1.LINKLIB, because it is in the > LNKLST. > I think that both Gil and I are assuming malevolent intent to do a denial of service. Or maybe somebody who did: //SYSLIB DD DSN=SYS1.LINKLIB ,DISP=SHR Note that blank before the , which makes the ,DISP=SHR a comment and thus defaults to DISP=NEW. Which causes an enclusive ENQ on the DSN. We have actually had that problem, although not with SYS1.LINKLIB. A person did it, by accident, in a PROC. Used the PROC in a production job, run by CA-7 with CA-11 restart enabled. CA-11 promptly deleted the master file referenced and then the step failed with a JCL error. Panic ensued trying to find a backup. We lost a day of on-line processing. > > Kees. > > -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
