You can't share PDSE in such an environment. You can "get away"  with only and 
rarely updating from one LPAR, and reading in the others.

Multiple RACF databases?  Are the Catalogs the same and shared between all 3 
LPARS?

Is the site using SMS?

> -----Original Message-----
> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On
> Behalf Of Gord Neill
> Sent: Thursday, November 24, 2022 12:55 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: To share or not to share DASD
> 
> [EXTERNAL EMAIL]
> 
> G'day all,
> I've been having discussions with a small shop (single mainframe, 3 separate
> LPARs, no Sysplex) regarding best practices for DASD sharing.  Their view is 
> to
> share all DASD volumes across their 3 LPARs (Prod/Dev/Test) so their
> developers/sysprogs can get access to current datasets, but in order to do
> that, they'll need to use GRS Ring or MIM with the associated overhead.  I
> don't know of any other serialization products, and since this is not a 
> Sysplex
> environment, they can't use GRS Star.  I suggested the idea of no GRS,
> keeping most DASD volumes isolated to each LPAR, with a "shared string"
> available to all LPARs for copying datasets, but it was not well received.
> 
> Just curious as to how other shops are handling this.  TIA!
> 
> 
> Gord Neill | Senior I/T Consultant | GlassHouse Systems
> 
> 
> 
> 
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