Date: Mon, 1 Oct 2001 03:10:26 +0000
From: Timothy Shimmin <tes@boing.melbourne.sgi.com>
To: Charles Radeke <charles.radeke@hrz.tu-chemnitz.de>
Cc: linux-xfs@oss.sgi.com
Subject: Re: xfsdump/restore from cd
Message-ID: <20011001031026.L10761@boing.melbourne.sgi.com>
References: <3BB47E57.4F936128@hrz.tu-chemnitz.de>
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In-Reply-To: <3BB47E57.4F936128@hrz.tu-chemnitz.de>; from charles.radeke@hrz.tu-chemnitz.de on Fri, Sep 28, 2001 at 03:42:47PM +0200
Sender: owner-linux-xfs@oss.sgi.com
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Hi Charles,

On Fri, Sep 28, 2001 at 03:42:47PM +0200, Charles Radeke wrote:
> 
> my problem is the following:
> 
> I would like to backup a partition of some GB by burning cd's with
> splitted xfsdump , each is 650MB. Is it possible to use a cdrom-drive as
> a tape (like/dev/rmt)? and if, how to simulate the tape change? 

Can't really do this.
When dumping to a tape (which uses the drive_scsitape strategy)
it send mt commands to the tape device to do tape operations and get
status. This aint going to work for a non-tape device.

> I saw
> that is not possible to xfsrestore splitted dumps step by step, only the
> first succseeded (what is clear to me). I wont copy 7 cd's on an empty
> drive bevor I can do  cat <dumpname*> | xfsrestore - /<dir>
> 
> Or ist there another solution in general for my problem? I saw that the
> -d option is not available for xfsdump like at IRIX-xfsdump where I can
> set the size of the media.
> 
This option is available in Linux/XFS too but I don't think this is of 
use to you.  It is for the drive_scsitape strategy where a dump is split 
into multiple files on tape (media-files). This is so that a bad tape
can have the good media files still restored.

So what are possible solutions ?
(a) try using split(1) to split up the dump output from stdout
    But this would require room for the split files.
(b) write your own drive strategy for xfsdump/xfsrestore :)

--Tim