Re: AS/400 and DB2 vs. Unix and Oracle

From: <crobato_at_kuentos.guam.net>
Date: 1996/01/24
Message-ID: <4e4dcj$7qm_at_lehi.kuentos.guam.net>#1/1

In <4e3ac8$117a_at_locutus.rchland.ibm.com>, brutman_at_bruteforce.rchland.ibm.com (Michael Brutman) writes:
>Correction - v3r6 (RISC) is not using a microkernel. When I think hear
>the word microkernel, I think of something like Mach which provides the
>bare minimum and relies on higher layers to define & present the
>operating system. AS/400s might use a microkernel some day, but our
>current implementations do not.

In all due respect, since you work for IBM, I should take your word from it.

But I did thought that I read that OS/400 r3.6 uses the microkernel from IBM's own web pages on the AS/400 (http://www.as400.ibm.com). Maybe I should check again.

On the OS/400 structure, it appears to me that much of what OS/400 appears to be for the user and the programs are very high level, while the Machine Interface or MI seems to provide only rudimentary hardware functions, much like a kernel does. I can be wrong, just stating an opinion.

As for being object oriented, everything OO seems to imply that you have a prexisting supply of base classes of objects. New objects are then created from these base classes, using inheritance. But isn't that how users, printers, display terminals and other stuff, created and configured inside OS/400? Such as creating a new printer configuration from *PRT class, etc? Or the way every object created by the user inherits that user's security class, even for just a simple file?

Rgds,

Chris

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Chiusagi Tsukino/Sailor Chibimoon *****crobato_at_kuentos.guam.net***** Received on Wed Jan 24 1996 - 00:00:00 CET