From owner-freebsd-questions@FreeBSD.ORG Sun Oct 18 13:29:27 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 1F2191065679 for ; Sun, 18 Oct 2009 13:29:27 +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 BA2E48FC0C for ; Sun, 18 Oct 2009 13:29:26 +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 n9IDSUlB068643; Sun, 18 Oct 2009 09:28:30 -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 n9IDST8G068642; Sun, 18 Oct 2009 09:28:29 -0400 (EDT) (envelope-from jerrymc) Date: Sun, 18 Oct 2009 09:28:29 -0400 From: Jerry McAllister To: Tim Judd Message-ID: <20091018132829.GB68596@gizmo.acns.msu.edu> References: <1255727601.4640.4.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> <20091016213732.GA61433@gizmo.acns.msu.edu> <20091017232131.GB66093@gizmo.acns.msu.edu> <1255828485.5100.3.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: User-Agent: Mutt/1.4.2.2i Cc: freebsd-questions@freebsd.org, Stevan Tiefert 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: Sun, 18 Oct 2009 13:29:27 -0000 On Sat, Oct 17, 2009 at 08:09:22PM -0600, Tim Judd wrote: > On 10/17/09, Stevan Tiefert wrote: > > Am Samstag, den 17.10.2009, 18:49 -0600 schrieb Tim Judd: > >> On 10/17/09, Jerry McAllister wrote: > >> > >> > >> > You do not need to. dump alrady writes that when it finishes each time. > >> > If you to that, you will get a second one at that location. > >> > > >> > You do not need to do the rewind and mt fsf between each dump. I just > >> > do it to make it very clear to myself in my scripts what I am expecting > >> > and that I am doing it right. > >> > > >> > ////jerry > >> > >> > >> > >> If dump is the tool for tapes, and tar is named after tape archives... > > > > Please, no flamewar!!! > > Wasn't planning on starting one. Sorry if it came across that way. > > > > >> Do both of these utilities write the *proper* EOF to whatever medium > >> it's writing to? > > > > They both write EOF. > > > >> I bring this up, because dump can also write to a file on a formatted > >> FS. Does the file end with this same EOF? What does tar do? > > > > There is only one EOF: The EOF. > > > > > >> Why have a mt weof function if it's useless? I'm loosing the logic in > >> this one, trying to make sure things work as they should. I admit > >> tapes on bsd are so foreign to me, I might as well be speaking > >> $another-language. > > > > weof is not useless. There are some file operations without writing an > > EOF, like streams or something like that, but tar and dump are writing > > with an EOF at the end of files :-) > > > So it's a item for "good measure" rather than an item "as necessity" > in creating backups. Not a good measure. It would do something different from what you expect. You might get 2 EOF-s in a row and the system think you have two files - one with stuff and one empty one. ////jerry > > Thanks for all the info. I'm happy knowing more. > > > --Tim > _______________________________________________ > 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"