I am not even sure that XLINK ought to be in the equation. Requiring it restricts the functionality to CSE environments.
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] > Behalf Of Jeff Gribbin, EDS > Sent: Thursday, September 07, 2006 9:02 AM > To: [email protected] > Subject: Re: VM directory entry for shared DASD > > > Well Alan, as you've, "Opened the floor for discussion" - > here's my two = > > penn'orth on how I think it SHOULD work. > > I think we're all pretty-much agreed on Virtual R/R support within a > single VM image, it's when to issue a REAL R/R that's the > sticking-point.= > > > I would contend that a REAL R/R should be issued whenever the > virtual R/R= > > is honoured on ANY minidisk associated with a real volume > (that supports = > > real R/R) that's under control of cross-system link (aka XLINK) or > whenever the subject minidisk begins on real cylinder zero. > > I would like to retain the "V" appendage to explicitly tell CP which > minidisks are subject to virtual R/R support because this > would protect m= > e > from, "denial of service" behaviour based on someone > realising that their= > > CMS minidisk is on a cross-system-linked disk and that they > can therefore= > > mess things up by issuing a RESERVE CCW. However, this is > unlikely enough= > > that I'd be willing to be persuaded that CP should simply > honour all R/R = > > activity on all minidisks under the scheme outlined above. > (Maybe relocat= > e- > zero should imply, "V" but it needs to be explicitly coded on > non-relocat= > e > zero?) > > While I was at it, I would also extend the automatic > assignment of SHARED= > > status to any real volume that's put under XLINK control at > the time that= > > it's ATTACHED to SYSTEM, with (of course) the option of using the > appropriate SET command to change this to cater for, "unusual" > circumstances. I find the current mechanisms for establishing SHARED > status on real packs tiresome - and it'd be so natural to > assume shared = > > for XLINK packs. > > OK, let's see what others think :-) > > Regards > Jeff Gribbin >
