From owner-freebsd-hackers Tue Mar 7 11:36:18 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mta.scient.com (mta.Scient.COM [208.29.209.245]) by hub.freebsd.org (Postfix) with SMTP id 4C0B437BDA0 for ; Tue, 7 Mar 2000 11:36:14 -0800 (PST) (envelope-from cnielsen@scient.com) Received: (qmail 22884 invoked from network); 7 Mar 2000 19:36:08 -0000 Received: from tep01-sfo.scient.com (HELO ender.scient.com) (208.29.209.9) by mta.scient.com with SMTP; 7 Mar 2000 19:36:08 -0000 Received: (qmail 696 invoked by uid 1001); 7 Mar 2000 06:34:49 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14532.41736.837993.704247@ender.scient.com> Date: Mon, 6 Mar 2000 22:34:48 -0800 (PST) From: Christopher Nielsen To: kc5vdj@swbell.net Cc: mbac@nyct.net (Michael Bacarella), freebsd-hackers@FreeBSD.ORG Subject: Re: Copy-on-write filesystem In-Reply-To: <200003040245.UAA10031@ppp-207-193-2-159.kscymo.swbell.net> References: <200003040245.UAA10031@ppp-207-193-2-159.kscymo.swbell.net> X-Mailer: VM 6.72 under 21.1 (patch 9) "Canyonlands" XEmacs Lucid Reply-To: cnielsen@pobox.com Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >>>>> "Jim" == Jim Bryant 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message