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List:       linux-ha-dev
Subject:    Re: [Linux-ha-dev] HA for automation?
From:       Alan Robertson <alanr () unix ! sh>
Date:       2001-10-25 7:31:55
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Robert Schwebel wrote:
> 
> Alan,
> 
> On Wed, 24 Oct 2001, Alan Robertson wrote:
> > I know of one person who used it for a badge reader application.
> > This isn't exactly what you're asking about, but it's the closest I'm
> > personally aware of.
> 
> I thought more of something like an embedded PC which is controlling some
> I/O systems. There are several conventional SPS systems out there which
> have redundant CPUs, so it might be interesting to see if this is possible
> with Linux as well. The problem will be how to connect the IO subsystems
> to the PCs in a way that they can be switched over from one machine to
> another. Would be great if anyone had experience with that...

It depends on what kind of I/O systems they are.

I know of one project where the I/O systems are connected to the CPUs via
ethernet.  If your I/O system can tolerate two masters connected at once,
and you can activate and deactivate the then you can probably get it to
work.

Ideally you'd like to be able to disconnect one and repair it while the
other one goes on.  But, this is more a question of electrical design than
of software design.

	-- Alan Robertson
	   alanr@unix.sh
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