From owner-freebsd-questions@FreeBSD.ORG Mon Nov 5 02:24:32 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 180657D4 for ; Mon, 5 Nov 2012 02:24:32 +0000 (UTC) (envelope-from rfg@tristatelogic.com) Received: from outgoing.tristatelogic.com (segfault.tristatelogic.com [69.62.255.118]) by mx1.freebsd.org (Postfix) with ESMTP id E64CF8FC14 for ; Mon, 5 Nov 2012 02:24:31 +0000 (UTC) Received: from segfault-nmh-helo.tristatelogic.com (localhost [127.0.0.1]) by segfault.tristatelogic.com (Postfix) with ESMTP id 821B25081B for ; Sun, 4 Nov 2012 18:24:25 -0800 (PST) To: freebsd-questions@freebsd.org Subject: Re: Questions about dump/restore to/from DVD media In-Reply-To: Date: Sun, 04 Nov 2012 18:24:25 -0800 Message-ID: <21460.1352082265@tristatelogic.com> From: "Ronald F. Guilmette" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Nov 2012 02:24:32 -0000 In message Mehmet Erol Sanliturk wrote: >Assume one file will NOT be copied more than ONE DVD , i.e. , each file >will be completely recorded on one DVD : > >http://en.wikipedia.org/wiki/Cutting_stock_problem The problem you cited is an interesting one, but I do not believe that it is at all relevant to the current discussion for the simple reason that this "cutting problem" is based on the assmption that one "thing" (e.g. a cut piece of paper) cannot be spread across two or more of the available units of raw material (e.g. a standard roll of paper). I'm sure that is true for paper, but as regards to FreeBSD partition backups, these have always been allowed to cross output volume boundaries, I think, e.g. spilling off the end of one backup tape and onto the beginning of the next backup tape. Regards, rfg