[Gllug] multi tape backups

[Alain Williams]

On Mon, Jun 26, 2006 at 04:52:59PM +0100, Bruce Richardson wrote:
> On Mon, Jun 26, 2006 at 01:09:03PM +0100, Alain wrote:
> > On Mon, Jun 26, 2006 at 12:45:51PM +0100, Bruce Richardson wrote:
> > > On Mon, Jun 26, 2006 at 12:32:24PM +0100, Alain wrote:
> > > > 
> > > > Anyone got any suggestions ?
> > > 
> > > Amanda.  It added multitape support with version 2.5.  You could
> > > replicate your existing set-up quite easily and gain some nice extras.
> > 
> > AFIR Amanda uses tar to write the tape ....
> 
> Or dump.  Nevertheless, it can now split the images that it writes to
> tape across multiple media volumes (e.g. tapes).  The downside is that
> you would need to use amanda's recovery/restore tools to get the data
> back.  But the tools are good.
> 
> Or you could try star.

I ended up fixing it as follows, tar has an option to read the files to
archive from a file (which cannot be stdin 'cos it reads from stdin
when prompting for a new tape :-) ), you need to give the --no-recursion
option to make this work nicely.

	mkfifo /tmp/fifo

	find XXX -depth -newer ./DateFile > /tmp/fifo &

	tar cMf /dev/nst0 -T /tmp/fifo --no-recursion

I now need to play with mt ... on readback the tape doesn't stream (it
starts/stops even when tar is just listing & so has no disk i/o to do).

-- 
Alain Williams
Parliament Hill Computers Ltd.
Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/

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