From owner-freebsd-questions@FreeBSD.ORG Mon Mar 7 19:41:19 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5F7C616A4CE for ; Mon, 7 Mar 2005 19:41:19 +0000 (GMT) Received: from clunix.cl.msu.edu (clunix.cl.msu.edu [35.9.2.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id F342C43D46 for ; Mon, 7 Mar 2005 19:41:18 +0000 (GMT) (envelope-from jerrymc@clunix.cl.msu.edu) Received: (from jerrymc@localhost) by clunix.cl.msu.edu (8.11.7p1+Sun/8.11.7) id j27JfFR11759; Mon, 7 Mar 2005 14:41:16 -0500 (EST) From: Jerry McAllister Message-Id: <200503071941.j27JfFR11759@clunix.cl.msu.edu> To: atkielski.anthony@wanadoo.fr Date: Mon, 7 Mar 2005 14:41:15 -0500 (EST) In-Reply-To: <1145660633.20050307160515@wanadoo.fr> from "Anthony Atkielski" at Mar 07, 2005 04:05:15 PM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit cc: questions@freebsd.org Subject: Re: What's the easiest way to do a backup and verify? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Mar 2005 19:41:19 -0000 > > Jerry McAllister writes: > > > Actually, if used frequently for backups - such as every day, DAT is > > notoriously prone to failure. > > I've heard this for years, but I've never encountered it, on my own > systems or on any others. My drives are HP SureStore SCSI drives. > Currently I have BASF tapes, and they've gone through about 40 cycles. > I take backups every few days, or whenever there are large changes to > the data on the server (most of the time the only changes are log files > and things like that). > > > The only real thing you can do is to read back the tape and look > > for a couple of files with fairly high inode numbers for each file > > system dumped. If you can read them, you can assume the tape > > is readable. > > I'm surprised there isn't just some way of reading the tape and doing a > few simple sanity checks on the data (without comparing it to anything). > A drive or tape error would likely show on such checks. It would seem to be a useful thing, but there is nothing that I know of. Guess you now have something to do in your spare time. ////jerry > > -- > Anthony > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >