From owner-freebsd-questions Mon Jan 21 1: 1:19 2002 Delivered-To: freebsd-questions@freebsd.org Received: from albatross.prod.itd.earthlink.net (albatross.mail.pas.earthlink.net [207.217.120.120]) by hub.freebsd.org (Postfix) with ESMTP id 8E8CC37B41C for ; Mon, 21 Jan 2002 01:01:13 -0800 (PST) Received: from dialup-209.247.139.76.dial1.sanjose1.level3.net ([209.247.139.76] helo=blossom.cjclark.org) by albatross.prod.itd.earthlink.net with esmtp (Exim 3.33 #1) id 16SaK3-0002Oj-00; Mon, 21 Jan 2002 01:01:03 -0800 Received: (from cjc@localhost) by blossom.cjclark.org (8.11.6/8.11.3) id g0L8xJ969362; Mon, 21 Jan 2002 00:59:19 -0800 (PST) (envelope-from cjc) Date: Mon, 21 Jan 2002 00:59:10 -0800 From: "Crist J . Clark" To: Sir Cc: mwm@mired.org, questions@FreeBSD.ORG Subject: Re: The tower of Hanoi Message-ID: <20020121005910.J66815@blossom.cjclark.org> References: <3C4B83A4.FA87DB7E@mediaone.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3C4B83A4.FA87DB7E@mediaone.net>; from postroad@mediaone.net on Sun, Jan 20, 2002 at 09:57:42PM -0500 X-URL: http://people.freebsd.org/~cjc/ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sun, Jan 20, 2002 at 09:57:42PM -0500, Sir wrote: > I was following a thread in the freebsd mailing list that you replied > on. Seems like you have some experience with "dump". A read of the man > pages has a realy baffling bit about the tower of hanoi algorithm. It > says incrementals should be taken on a daily basis 3 2 5 4 7 6 9 8 9 > 9.... It then goes on to say that a weekly should be taken with level > 1. Well, there's more than 7 levels there so I'm not sure how it all > fits together. It's all just a suggestion. If you were to do the once-a-week thing, it would work something like, S S M T W T F 1 3 2 5 4 6 9 Rinse, repeat... The motivation for using that type of algorithm is that you tend to balance the amount of data dumped each day (amount of dump media consumed) versus how many steps one would need to take to restore a filesystem. > It reads like they should be done all in the same day?? No, in the example, we are doing one dump per day. > I > was under the impression you shouldn't "dump" a disk unles it's > umount'd. Ideally, you would like a static filesystem, but this simply is not realistic for most sites. dump(8) has no problem dumping a live file system, but don't fool youself into believing a dump is a "snapshot" of the filesystem. > And, for us real newbies, how do you un-dump?? restore(8). -- Crist J. Clark | cjclark@alum.mit.edu | cjclark@jhu.edu http://people.freebsd.org/~cjc/ | cjc@freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message