Manipulation DAT tapes on linux

[JM]

thanks for all your replies..

hmm.. the tape says? 20G for uncompressed and 40G for compressed...

does this mean doing tar -zcf /dev/st0 is the 40G?
or
i have to activate the compression and let the drive its job?


TIA

On Wednesday 17 November 2004 13:30, Ilya Palagin wrote:
> JM wrote:
> > Hi,
> >
> > 	I have a 4mm DDS-150 tape in linux and I was wondering if someone can
> > answer this questions.
>
> First - you need 'mt' tools installed.
>
> > 	is it possible to extract selected file or files from an archive without
> > extracting all the data from the tape?
>
> Extract separate files like this:
>
> tar xvf /dev/st0 /home/user/file01
>
> > 	is it possible to add a directory with files to a tape archive? (tape
> > has an existing data on it)
>
> Jump to the end of data:
> mt -f /dev/nst0 eod
>
> And add directory
> tar cvf /dev/nst0 /home/dir
>
> > 	is it possible to get the tape usage?
>
> Rewind to the end of data and get current block, see man mt.  Then
> calculate taken space.
>
> > 	what i usually do is tar -cvf /dev/st0 ..... .... ....
>
> Use /dev/nst0 for multiple archives, this device doesn't rewind tape
> after command execution.  For instance, you have 5 archives on a tape.
> To extract file /etc/passwd from archive #3, execute:
>
> mt -f /dev/nst0 fsf 3
> tar xvf /dev/nst0 /etc/passwd
> mt -f /dev/nst0 rewind
>
> > TIA,
> >
> >
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