From owner-freebsd-questions@FreeBSD.ORG Fri Oct 16 21:38:25 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6888E106566B for ; Fri, 16 Oct 2009 21:38:25 +0000 (UTC) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: from gizmo.acns.msu.edu (gizmo.acns.msu.edu [35.8.1.43]) by mx1.freebsd.org (Postfix) with ESMTP id 2D7688FC19 for ; Fri, 16 Oct 2009 21:38:24 +0000 (UTC) Received: from gizmo.acns.msu.edu (localhost [127.0.0.1]) by gizmo.acns.msu.edu (8.13.6/8.13.6) with ESMTP id n9GLbWNq061475; Fri, 16 Oct 2009 17:37:32 -0400 (EDT) (envelope-from jerrymc@gizmo.acns.msu.edu) Received: (from jerrymc@localhost) by gizmo.acns.msu.edu (8.13.6/8.13.6/Submit) id n9GLbW38061474; Fri, 16 Oct 2009 17:37:32 -0400 (EDT) (envelope-from jerrymc) Date: Fri, 16 Oct 2009 17:37:32 -0400 From: Jerry McAllister To: Stevan Tiefert Message-ID: <20091016213732.GA61433@gizmo.acns.msu.edu> References: <1255727601.4640.4.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1255727601.4640.4.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> User-Agent: Mutt/1.4.2.2i Cc: freebsd-questions@freebsd.org Subject: Re: small question about tape-based dumps X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Oct 2009 21:38:25 -0000 On Fri, Oct 16, 2009 at 11:13:21PM +0200, Stevan Tiefert wrote: > Hello list, > > one example: If I have three partitions and I want to backup every day > these partitions, will I need 21 tapes? > > I ask because it seems it is not possible to place more than one dump on > one tape, isn't it? You can easily put more than one dump on a tape if there is room enough for them. Check out the mt(1) command. Something like mt fsf 1 will skip over the first dump file so you can write the second. mt fsf 2 will skip over two files, etc. That is dump files, not files within the dump. Each dump of a filesystem is one file. If you need to restore, it is just the same. The first dump is the first file. The second dump is reached by skipping 1 file with the mt command, etc. I actually rewind and skip between each dump of multiples made to the same tape. I also use the no-rewind device for the tape. So first dump is: dump 0af /dev/nsa0 / For second dump: mt -f /dev/nsa0 rewind mt -f /dev/nsa0 fsf 1 dump 0af /dev/nsa0 /usr third mt -f /dev/nsa0 rewind mt -f /dev/nsa0 fsf 2 dump 0af /dev/nsa0 /var etc. when all done mt -f /dev/nsa0 rewind mt -f /dev/nsa0 offline I have this all in a script that also writes an index file as the first file on the tape. Of course if you are doing a change dump the dump command is going to look more like: dump 1af /dev/nsa0 etc. ////jerry > > With regards > Stevan Tiefert > > > > _______________________________________________ > 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"