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Date:      Sat, 09 Nov 2002 18:00:07 +0100
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Larry Sica <lomifeh@earthlink.net>
Cc:        Nick Rogness <nick@rogness.net>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: Filesystem corruption 
Message-ID:  <45812.1036861207@critter.freebsd.dk>
In-Reply-To: Your message of "Sat, 09 Nov 2002 11:55:06 EST." <FFCEB30D-F403-11D6-BCF2-000393A335A2@earthlink.net> 

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In message <FFCEB30D-F403-11D6-BCF2-000393A335A2@earthlink.net>, Larry Sica wri
tes:
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Not sure if hackers is the correct place to ask about this but...
>
>On Friday, November 8, 2002, at 06:28 PM, Nick Rogness wrote:
>
>>
>> We have a server that is doing some wierd things.  /var/mail filesystem
>> (/dev/idad2s1e)  is reporting errors during certain tasks (like dump).
>> It does fsck clean umounted.  I have yet to see this type of error and
>> can't tell whether this is a bug or a hardware problem:
>>
>> Nov  8 15:41:20 pop1 /kernel: dscheck(#idad/0x20014): negative b_blkno
>> -791620152
>> Nov  8 15:41:20 pop1 /kernel: dscheck(#idad/0x20014): negative b_blkno
>
>I've seen mention of this before, not sure what the fix was.  I heard 
>about this a few years ago on some quantam drives, the guy updated his 
>firmware and it went away iirc.  Does it do this only when you dump or 
>under other circumstances?  If other circumstances, which ones?

The fix is to not run dump(8) on a live filesystem.  You should
either use a snapshot or umount the device.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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