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Date:      21 Oct 2002 22:12:24 -0400
From:      Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
To:        brent@kearneys.ca
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: DUMP: bad sblock magic number
Message-ID:  <444rbfw7av.fsf@be-well.ilk.org>
In-Reply-To: <20021021174837.A77115@kearneys.ca>
References:  <20021021174837.A77115@kearneys.ca>

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Brent Kearney <brent@kearneys.ca> writes:

> Hello, I'm trying the following on FreeBSD 4.2:
> 
> dump -0 -h 0 -u -a -f /dev/nsa0 /home/foo
> 
> And the dump is dying with the message:
> 
>   DUMP: Dumping /home/shared to /dev/nsa0
>   DUMP: bad sblock magic number
>   DUMP: The ENTIRE dump is aborted.
> 
> /home/foo is not a mount point, but I seem to remember FreeBSD's dump 
> being able to dump subdirectories.

The man page seems to say otherwise, so you're on your own there.
Luckily, you have the source.

>                                     I can dump /home (which is a mount
> point) without any errors, so its not a problem with /dev/nsa0.  What
> does "bad sblock magic number" mean?

It means, more or less, that it can't find a valid filesystem for the
parameters given it.


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