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Date: Thu, 16 Aug 2001 08:09:00 +0200 (CEST)
From: Micke Josefsson <mj@isy.liu.se>
To: Adam Blake Michalak <blake@sba.miami.edu>
Subject: RE: dump and restore
Cc: freebsd-questions@FreeBSD.ORG
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On 16-Aug-01 Adam Blake Michalak wrote:
> Hello all.
> 
> I have another dump question (I think I blew up my computer)
> 
> Last night I used the dump command to back up / /usr and /var
> to an exabyte 8505.
> 
> I was starting with a tape at the top.
> 
> used the following command
> mt rewind
> mt comp on
> dump -0ua /dev/da0s1a
> dump -0ua /dev/da0s1f
> dump -0ua /dev/daos1e
> 
> When I went to run restore -i to inspect the tape 
> I did the following...
> 
> 
> mt rewind
> restore -i
> restore> what
> 
> it reprorted back that only /var was on the tape
> 
> It did not list / or /usr   
> 
> did dump wind the tape back to the top after each dump and rewrite
> from the top of the tape, blowing away the other 2 backups?
> 
> In the future do I need to use mt to write some type of "end of
> record" so that dump does not hose me in the future?
> 
> -Adam

It all depends on which device you wrote to. If your TAPE environment variable
is set to /dev/rsa0 then the tape will rewind after each command. If you use
/dev/nrsa0 then the tape will simply stop where it is and you can put another
dump on tape from that point.

To be certain I always do 'dump -0af /dev/nrsa0 /dev/da2s1'.

/M


----------------------------------
Michael Josefsson, MSEE
mj@isy.liu.se

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