Re: Multicast NFS

From: Brent Callaghan (Brent.Callaghan@eng.sun.com)
Date: 04/01/99-05:01:37 PM Z

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Date: Thu, 1 Apr 1999 15:01:37 -0800 (PST)
From: Brent Callaghan <Brent.Callaghan@eng.sun.com>
Message-Id: <199904012301.PAA27156@terra.eng.sun.com>
Subject: Re: Multicast NFS


Sean Bennet writes:
> I was considering how a Reliable Multicast, multi-hosts system
> might work.

If NFS is to be an Internet protocol, then high availability
and replication is certainly important and in-scope.

What you describe is very similar to an Auspex, Inc. product
called ServerGuard, take a look at the whitepaper at:

	http://www.auspex.com/pdf/tr12.pdf

It uses multicast with NFS version 2 and 3.


Notice that most of this can be implemented without any
changes to the core protocol.  I think the best approach
is to provide NFS v4 with protocol "hooks" e.g. volatile
filehandles, that make this kind of replication and
high-availability easier to do - yet keep such things
as quorum and replica synchronization protocols out
of v4.

	Brent

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