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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!howland.reston.ans.net!paladin.american.edu!auvm!USCMVSA.BITNET!LDW
- Message-ID: <IBM-MAIN%92122601275512@RICEVM1.RICE.EDU>
- Newsgroups: bit.listserv.ibm-main
- Date: Fri, 25 Dec 1992 23:26:00 PST
- Sender: IBM Mainframe Discussion list <IBM-MAIN@RICEVM1.BITNET>
- From: Leonard D Woren <LDW@USCMVSA.BITNET>
- Subject: Re: Logical Partitions/Physical Partitions
- Lines: 49
-
- On Fri, 25 Dec 1992 23:53:33 CST,
- David E Boyes <dboyes@IS.RICE.EDU> said:
- > > Even if you believe Richard's point of view, which I don't, you still
- > > have to take into account that MVS/ESA is still at least 5 years ahead
- > > of VM/ESA in dynamic reconfiguration capabilities.
- >
- > Go read the VM/ESA 1.2 announcements. I think you'll find a
- > number of improvements that bring VM/ESA to a much more favorable
- > position in this regard.
-
- When is G.A. for VM/ESA 1.2? When *was* G.A. for MVS/ESA V4?
- So maybe I was wrong; MVS/ESA V4 is 3-4 years ahead of VM/ESA, not 5.
-
- > > If you run brand z
- > > disks like we do, when you get an error in a page dataset, if it's MVS
- > > you can just PAGEDEL that page dataset and fix the disk. You have to
- > > shut down VM (and therefore all guests!) to fix it if it's on a VM
- > > pagespace. If the error is in spool, JES2 can be told not to use that
- > > track. VM has to be shutdown for repairs.
- >
- > You're missing the distinction between dedicated devices and
- > simulated devices again.
-
- No, you're missing my point, which I should have made more explicitly.
- If a critical *VM* disk has a problem, you have to shutdown *VM* to
- fix it, and therefore you have to shutdown your MVS *production*
- guest, because *some other* O.S. has a problem. This is just plain
- unacceptable in most shops. If the MVS production guest is under
- LPAR, you don't have this problem.
-
- > > MVS/ESA V4 supports
- > > dynamically changing the hardware configuration, so that you can add
- > > and remove devices without an IPL & POR. Where is the VM support for
- > > this?
- >
- > VM/ESA 1.2.
-
- I think not, judging from your next question.
-
- > It's not clear to me how MVS deals with changes that
- > require an IOCP change, though -- doesn't that still require a
- > disruptive IML?
-
- No!
-
- From what you're saying, I'd guess that VM/ESA 1.2 still doesn't
- support dynamic reconfiguration like MVS/ESA V4.2 does.
-
- /Leonard
-