At a time my customer had some softwares that all required a shared minidisk with Reserve/Release (MIM, STK, ...), these softwares required two disks for safety; STK required 4 as we had 2 silos. With VM's restriction that real R/R works for a fullpack only,, it would have costed us 6 (or was it 8?) fullpacks with only a couple of cylinders used. So, I wrote a small CP mod to remove that fullpack requirement. A new restriction arose: no more than 1 minidisk with R/R on a single pack, restriction not enforced by my mod, we had to keep that in mind. Mod still in place on our z/VM 5.2 - till end june when my customer shuts down the last VM partition and I will be without z/VM work. Every virtual thing I built up since 20 years ago will stop living and be mummified on some DDR tapes either for a while or until z/VM resurrects to support Linux. Happily there are some visible remains on http://www.vm.ibm.com/download/packages/
2008/4/10, McKown, John <[EMAIL PROTECTED]>: > > > -----Original Message----- > > From: The IBM z/VM Operating System > > [mailto:[EMAIL PROTECTED] On Behalf Of Schuh, Richard > > Sent: Thursday, April 10, 2008 1:30 PM > > To: IBMVM@LISTSERV.UARK.EDU > > Subject: Re: Ten Questions to ask a Prospective z/VM Systems > > Programmer > > > > > > If you share with a user outside your own LPAR, you need real > > Reserve/Release, not virtual. The virtual is for when you > > have multiple > > guests running in the same LPAR, under the same CP, who need the > > Reserve/release. Virtual reserve/Release will do nothing to prevent > > clashes with other LPARs. > > > > > > Regards, > > Richard Schuh > IIRC, virtual reserve / release plus a full-volume mdisk is needed to > share with other systems on other LPARs successfully. I.e. the virtual > reserve / release, in that case, actually does a reserve to the volume > in question. > > -- > John McKown > Senior Systems Programmer > HealthMarkets > Keeping the Promise of Affordable Coverage > Administrative Services Group > Information Technology > > The information contained in this e-mail message may be privileged > and/or confidential. It is for intended addressee(s) only. If you are > not the intended recipient, you are hereby notified that any disclosure, > reproduction, distribution or other use of this communication is > strictly prohibited and could, in certain circumstances, be a criminal > offense. If you have received this e-mail in error, please notify the > sender by reply and delete this message without copying or disclosing > it. > -- Kris Buelens, IBM Belgium, VM customer support
