Date: Mon, 6 Mar 2000 22:34:48 -0800 (PST) From: Christopher Nielsen <cnielsen@pobox.com> To: kc5vdj@swbell.net Cc: mbac@nyct.net (Michael Bacarella), freebsd-hackers@FreeBSD.ORG Subject: Re: Copy-on-write filesystem Message-ID: <14532.41736.837993.704247@ender.scient.com> In-Reply-To: <200003040245.UAA10031@ppp-207-193-2-159.kscymo.swbell.net> References: <Pine.BSF.4.05.10003031338080.1135-100000@bsd1.nyct.net> <200003040245.UAA10031@ppp-207-193-2-159.kscymo.swbell.net>
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>>>>> "Jim" == Jim Bryant <jbryant@ppp-207-193-2-159.kscymo.swbell.net> writes:
Jim> This is not a microsoft innovation, actually, I believe it
Jim> was a VMS innovation. It's called a generational filesystem.
Jim> the original is stored, and later generations of the file are
Jim> stored as diffs.
IIRC, plan9 has something similar with its three-tier, hierarchical
filesystem, except that it's not diffs that are copied, it's blocks
that have been written since the last dump.
See http://plan9.bell-labs.com/plan9/doc/9.html for more details.
--
Christopher Nielsen
(enkhyl|cnielsen)@pobox.com
Enkhyl on IRC
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