Date: Sun, 18 Oct 2009 09:26:42 -0400 From: Jerry McAllister <jerrymc@msu.edu> To: Tim Judd <tajudd@gmail.com> Cc: Jerry McAllister <jerrymc@msu.edu>, freebsd-questions@freebsd.org Subject: Re: small question about tape-based dumps Message-ID: <20091018132642.GA68596@gizmo.acns.msu.edu> In-Reply-To: <ade45ae90910171749g5accf984j9e5d766193fb9d39@mail.gmail.com> References: <1255727601.4640.4.camel@x1-6-00-11-09-00-e4-00.search.b.superkabel.de> <20091016213732.GA61433@gizmo.acns.msu.edu> <ade45ae90910161943o7695d436wed8b8a69d92ef994@mail.gmail.com> <20091017232131.GB66093@gizmo.acns.msu.edu> <ade45ae90910171749g5accf984j9e5d766193fb9d39@mail.gmail.com>
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On Sat, Oct 17, 2009 at 06:49:02PM -0600, Tim Judd wrote: > On 10/17/09, Jerry McAllister <jerrymc@msu.edu> wrote: > <snip> > > > 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 > > <snip> > > If dump is the tool for tapes, and tar is named after tape archives... > > Do both of these utilities write the *proper* EOF to whatever medium > it's writing to? > > 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? EOF means something completely different on a file system than it does on a tape. So, yes, the system knows where the file ends on both, but it is done differently. ////jerry > > 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. It is not useless. It just isn't necessary in that situation. Remember, mt(1) is used on more than just dumps. ////jerry > > > Please help.
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