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Date: Mon, 22 Apr 2002 14:19:07 -0400
From: Sandy Harris <pashley@storm.ca>
Organization: Flashman's Dragoons
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To: Libor Vanlk <libor@conet.cz>
CC: linux-kernel@vger.kernel.org
Subject: Re: Adding snapshot capability to Linux
In-Reply-To: <3CC3ECD2.9000205@conet.cz> <20020422170745.GD3017@turbolinux.com>
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Andreas Dilger wrote:
> 
> On Apr 22, 2002  12:58 +0200, Libor Vanlk wrote:
> > I'm going to start my dissertation work which is "Adding snapshop
> > capability to Linux kernel with copy-on-write support". ...

> > So I'd like if you can send me any suggestions/tips/warnings/links etc.
> > before I start coding so I know what should I avoid/use.
> 
> Please see:
> http://www-mddsp.enel.ucalgary.ca/People/adilger/snapfs/
> 
> What you describe is exactly what snapfs does. ...

A related thing to look at would be the Plan 9 file system.
http://www.cs.bell-labs.com/plan9dist/

It is an entirely different design using copy-on-write and a
form of snapshotting such that something like:

cd //2001/12/25/foo

puts the user in directory /foo as it was at daily backup time
on Christmas day last year.

The original Plan 9 system used WORM drives with hard drives
acting as cache. I suspect the design could work without WORM.
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