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Date:      Thu, 6 Mar 2003 08:57:05 -0600
From:      Mike Meyer <mwm-dated-1047394626.aaa80a@mired.org>
To:        joe mcguckin <joe@via.net>
Cc:        <questions@freebsd.org>
Subject:   Re: DUMP errors  FreeBSD 4.7-RC
Message-ID:  <15975.25025.373837.32139@guru.mired.org>
In-Reply-To: <BA8C00CD.242AF%joe@via.net>
References:  <BA8C00CD.242AF%joe@via.net>

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In <BA8C00CD.242AF%joe@via.net>, joe mcguckin <joe@via.net> typed:
> While dumping a 75G partition, I receive the following errors:
>  DUMP: 21.52% done, finished in 0:51
>   DUMP: read error from /dev/ad2s1: Invalid argument: [block -622926708]:
> count=7168
> /var/log/messages:
> Mar  5 19:15:20 mail /kernel: dscheck(#ad/0x20012): negative b_blkno
> -622926708
> 
> What does this mean? Is there a known problem with dump?

My first reaction is that there's something wrong with your disk drive
or file system. The system is trying to do disk I/O to a negative
block number on the drive, which simply doesn't exist. On second
thought, it may be a bug somewhere in the system - not necessarily
dump. Try fsck'ing the file system in r/o mode to see if you have a
problem on it. If that's okay, can you try doing a recursive copy of
the file system to /dev/null to see if the error shows up there as
well?

	<mike
-- 
Mike Meyer <mwm@mired.org>		http://www.mired.org/consulting.html
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

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