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- Newsgroups: comp.arch
- Path: sparky!uunet!utcsri!cdf.toronto.edu!cdf.toronto.edu!jdd
- From: jdd@cdf.toronto.edu (John DiMarco)
- Subject: Re: "Open Systems" (was Re: Comparison of Alpha, MIPS and PA-RISC-II wanted)
- Message-ID: <jdd.724378408@cdf.toronto.edu>
- Organization: University of Toronto Computing Disciplines Facility
- References: <jdd.723756690@cdf.toronto.edu> <id.5POV.SIJ@ferranti.com> <jdd.724102048@cdf.toronto.edu> <id.G6TV.801@ferranti.com>
- Date: Tue, 15 Dec 1992 00:13:28 GMT
- Lines: 29
-
- In <id.G6TV.801@ferranti.com> peter@ferranti.com (Peter da Silva) writes:
-
- >In article <jdd.724102048@cdf.toronto.edu> jdd@cdf.toronto.edu (John DiMarco) writes:
- >> 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.
-
- Good point. Certainly ease of replacement varies from case to case. Comparing
- the "openness" of two options isn't always an easy exercise.
-
- >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.
-
- This is interoperability (in this case, between VMS and DOS boxes), not
- openness. Let's not confuse the two.
-
- John
- --
- John DiMarco jdd@cdf.toronto.edu
- Computing Disciplines Facility Systems Manager jdd@cdf.utoronto.ca
- University of Toronto EA201B,(416)978-1928
-