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- Newsgroups: comp.arch
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!menudo.uh.edu!sugar!ficc!peter
- From: peter@ferranti.com (Peter da Silva)
- Subject: Re: "Open Systems" (was Re: Comparison of Alpha, MIPS and PA-RISC-II wanted)
- Message-ID: <id.G6TV.801@ferranti.com>
- Organization: Xenix Support, FICC
- References: <jdd.723756690@cdf.toronto.edu> <id.5POV.SIJ@ferranti.com> <jdd.724102048@cdf.toronto.edu>
- Date: Sun, 13 Dec 1992 21:55:05 GMT
- Lines: 52
-
- In article <jdd.724102048@cdf.toronto.edu> jdd@cdf.toronto.edu (John DiMarco) writes:
- > "Openness" is relative.
-
- Of course it is. It's also relative to what your application is. It has nothing
- to do with whether the software is proprietary, but rather whether the
- interfaces you need for your application are available in a form compatible
- with the system in question.
-
- > Ultrix on a VAX is more "open" than VMS on a VAX,
- > since you can replace the Ultrix/VAX combination with some other
- > UNIX-type OS/workstation combination with less pain than you can the VMS/VAX
- > combination.
-
- Yes.
-
- > SunOS on a SPARC-2 is more open than these, because you can
- > replace SunOS with stock SVR4 (eg. from ICL), and the SS2 with a SS2 clone,
- > with even less pain.
-
- What do you do when your application depends on NeWS, or Display Postscript?
-
- > This leads to the following definition: "Openness" is essentially a measure of
- > the minimum migration cost of replacing a system with another from a different
- > manufacturer.
-
- That's far too simple. I can replace a network of VAXen running Ultrix on
- DECnet more easily than I can replace a network of Suns running SunOS if my
- application is using DPS or NeWS (respectively), since DPS is available from
- more sources, but I can integrate an RS6000 in the Sun network a lot more
- easily than I can integrate it in the Ultrix network.
-
- > Note that calling Suns running SunOS "open" is a misleading thing, because in
- > comparison to a 386 running DOS (where you can change OS from MS-DOS to
- > DR-DOS and system units from one manufacturer to another without recompiling
- > your apps or retraining your users), suns are not really that open.
-
- If I have a network of DOS machines running Novell it's going to be really
- painful to provide Usenet news to these seats, and moderately painful just
- to give them file-level access to my VMS based VAXen, but if I'm running
- OpenNET it'll be quite easy... but OpenNET is only available from one vendor.
-
- > >Any system is only open where it exposes standard interfaces to applications,
- > >users, and other systems.
-
- > Standards are the means, "open" is the result.
-
- I agree, but not in the way you mean.
- --
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