From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([69.77.167.62] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1L6Ik7-0004N5-Sj for garchives@archives.gentoo.org; Sat, 29 Nov 2008 05:51:48 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 44088E04D2; Sat, 29 Nov 2008 05:51:45 +0000 (UTC) Received: from ik-out-1112.google.com (ik-out-1112.google.com [66.249.90.176]) by pigeon.gentoo.org (Postfix) with ESMTP id D261EE04D2 for ; Sat, 29 Nov 2008 05:51:44 +0000 (UTC) Received: by ik-out-1112.google.com with SMTP id b32so1445069ika.2 for ; Fri, 28 Nov 2008 21:51:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender :to:subject:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references :x-google-sender-auth; bh=/5op6KdoXzkXqaXlrRuJUOhZByBflvI7bkgRCnjbIng=; b=ms5e6XlSj846MEHOODhTdPgA4CkxUYtOZg6FrSthMdSzXzn31Nu4hs1FQwMxmXcQKc yd3dpTcep36TaA6Yi2BAhl+ptMXq8dzP2OSVLgYYZMjVlbbiY3JdxpU2EDHH8oPVkGhk wYTy+QcNQ2DJxqGKikWmnZIU8lrhUQuphy74M= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references:x-google-sender-auth; b=ZIcaXUDxn+WNUEGw6Ca3VpbOXxSr+fC7+eJZuHoL7I0Aw47YbeG4luDQ9DGLLd/NBt k5eSIjSaJMHDc3eqWLD2DWabisIBEGUGVyNa5uS8MW2G3LgCRqoZCwZrG0gbZnwt9D/T WRbsRWbxgRFTKFMKphTr7KcZ6i5BUzjFAIa7U= Received: by 10.210.10.8 with SMTP id 8mr9761755ebj.69.1227937904299; Fri, 28 Nov 2008 21:51:44 -0800 (PST) Received: by 10.210.34.20 with HTTP; Fri, 28 Nov 2008 21:51:44 -0800 (PST) Message-ID: <38af3d670811282151n59089c9fg88eb0aa2e06b2deb@mail.gmail.com> Date: Sat, 29 Nov 2008 03:51:44 -0200 From: "Jorge Peixoto de Morais Neto" Sender: jorgepeixotomorais@gmail.com To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: [OT] filesystems In-Reply-To: <1227787959.3316.11.camel@maya.local> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline References: <1227479490.26615.47.camel@rattus> <200811252007.55035.volker.armin.hemmann@tu-clausthal.de> <38af3d670811251124v7d447918v82b7ec11baafd1a9@mail.gmail.com> <200811252102.52130.volker.armin.hemmann@tu-clausthal.de> <38af3d670811251219n4c531baft7aa37951271b7f00@mail.gmail.com> <492c6aef.uN1RRcHNp8dUe+Nc%Joerg.Schilling@fokus.fraunhofer.de> <38af3d670811251600m784f43c3i944a4ac56b001c49@mail.gmail.com> <492D5CAF.3010504@f_philipp.fastmail.net> <1227787959.3316.11.camel@maya.local> X-Google-Sender-Auth: ea7809aa42680312 X-Archives-Salt: f6c129cf-b49d-47af-bc09-345e058f338c X-Archives-Hash: eea68db59b7dddc0c5f37202adbbd910 On Thu, Nov 27, 2008 at 10:12 AM, Daniel Troeder wro= te: > Am Mittwoch, den 26.11.2008, 15:26 +0100 schrieb Florian Philipp: >> > As for my photos, I can back all the collection to a single DVD (and >> > to a second one, since I keep hearing that DVD-Rs are unreliable), and >> > since I don't take new photos every week, this solution is fine. >> >> A second DVD-R won't solve the problem because optical disks degrade >> over time and the second one will degrade just as fast as the first. >> What you need to do is to check the disks periodically (once a year is a >> good time frame). >> I myself would add a textfile with md5sums for all files to the DVD so >> you don't have to check them visually. I have recently taken this decision too. Unfortunately I haven't done so for some old backups (fortunately they still seem healthy) > You can buy so called "archival grade" DVD-Rs that should work for 10-20 > years in a good environment. There are hugh differences between > products. In germany you can buy very good ones from Verbatim for around > 2=80/disk. This can be hard to find in my mid-sized Brazilian city. If I lived in the mega-metropolis of S=E3o Paulo, this would be far easier. And thanks very much for recommending Verbatim. I have heard of Taiyo Yuden, but that would likely be far harder to find. Speaking of md5sum/shasum, do you know some tool that adds data redundancy? I heard dvddistaster does this, but I guess it is limited to DVDs. It would be great fo find a general data redundancy tool. In the moment, with the tools I know, the best I can do is store the files twice, with md5sums/shasums to decide which version is correct. By the way, it seems from my (limited) experience that even sha256sums are IO-bound (even on my not-so-powerful Athlon XP 2600+), so it makes sense to calculate sha256sums (as instead of md5sums) even it is overkill. To be doubly sure, one can calculate sha256sums *and* md5sums.