Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!ssbell!mcmi!amperif!unocss!mlewis
From: mlewis@unocss.UUCP (Marcus S. Lewis)
Newsgroups: comp.arch
Subject: Re: AT&T 3B20D
Summary: online maintenance
Keywords: 3B20D
Message-ID: <822@unocss.UUCP>
Date: 9 Jun 89 02:56:20 GMT
References: <486@ntvax.UUCP>
Distribution: na
Organization: U. of Nebraska at Omaha
Lines: 24

In article <486@ntvax.UUCP>, yang1@ntvax.UUCP (cqyang class) writes:
> 
> 
>    I understood that the 3B20D also could be used as a general purpose 
> minicomputer, and there are not many machines I know of (execpt Tandems)
> that would allow board replacements while the machine is running. 

This is NOT a commercial - I don't work for Data General, and soon will not
be working with DG equipment. One of the main features of the new
MV/40000HA machine just now shipping is that the FEs can pull a  board
out of the box without too much hassle, and without shutting down the machine.
The HA stands for High Availability.  My boss wants one, I want one - can't
have one.
My understanding (also from a DG FE) was that the difference between a mini
and a mainframe was that on a mainframe you can to diagnostics and swapout
maintenance without shutting down.  What enables the MV/40 to do this is a
new bus (new to the MV series) controller.
Marc Lewis

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