Actually, I think that inside VSAM, what is specified via SHAREOPTIONS would 
override any JCL. But, you need to get past the JCL during allocation before 
VSAM can take over.

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU]
> On Behalf Of Tony Thigpen
> Sent: Tuesday, July 10, 2018 3:08 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: z/OS JCl vs. VSE JCL: VSAM files
> 
> So, DISP=SHR is not the default, as I thought was implied by John's statement
> that "Z/os VSAM is always accessed as DISP=SHR."
> 
> Tony Thigpen
> 
> Gibney, Dave wrote on 07/10/2018 05:49 PM:
> > If DISP=SHR (that is if not DISP is provided), then the JCL Default of
> > (NEW,PASS) would happen and the job would fail
> >
> >> -----Original Message-----
> >> From: IBM Mainframe Discussion List [mailto:IBM-
> m...@listserv.ua.edu]
> >> On Behalf Of Tony Thigpen
> >> Sent: Tuesday, July 10, 2018 2:43 PM
> >> To: IBM-MAIN@LISTSERV.UA.EDU
> >> Subject: Re: z/OS JCl vs. VSE JCL: VSAM files
> >>
> >> Then, why does every VSAM DD for every z/OS site I have worked with,
> >> always include DISP=SHR?
> >> (I guess, because it's a habit from non-VSAM files and nobody told
> >> them they did not have to do it.)
> >>
> >> Tony Thigpen
> >>
> >> John Clifford wrote on 07/10/2018 04:16 PM:
> >>> Z/os VSAM is always accessed as  DISP=SHR.
> >>
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