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Date:      Tue, 3 Aug 2004 03:51:44 +0200
From:      "Daniel Eriksson" <daniel_k_eriksson@telia.com>
To:        "'Scott Long'" <scottl@freebsd.org>
Cc:        'freebsd current' <current@freebsd.org>
Subject:   RE: Panic in today's current, UFS problem?
Message-ID:  <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAWq8251TAokWWTJuIdaScLgEAAAAA@telia.com>
In-Reply-To: <410EEAC8.8010900@freebsd.org>

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Scott Long wrote:

>> What I did:
>> 1. fdisk/label two 250GB discs hooked up to the on-board SATA=20
>> controller (using sysinstall) 2. copy ~20GB of data to both discs
>
> Is this step necessary in order to produce the panic?

I have no idea.

>> 3. successfully run the stress-test mentioned in Ville-Pertti=20
>> Keinonen's mail (above)
>
> Is this step necessary also?

Again, no idea.

>> 4. unmount both discs
>> 5. run "atacontrol create RAID0 128 ad20 ad22" (the two SATA discs) =
6.=20
>> fdisk/label the striped array (using sysinstall, forcing it to UFS1)=20
>> 7. mount the new partition, and create three empty dirs 8. *boom*
>>=20
>
> How reproducable is this, and does it always panic in the same spot?=20
> There is definitely some sort of buffer corruption going on, and =
either=20
> it's happening in the buffer/cache layer or it's a bad DMA from the =
drive.

Considering how much problems I've had with this machine lately I would =
not
at all be suprised if the error is somewhere else. The machine is
unfortunately a production machine, and trying to reproduce panics (with =
the
risks associated with that, such as corrupted user data) is not really =
an
option.

What I've done now is restart the server and run a newfs on the ataraid
array of the two SATA discs. I'm in the process of copying 400+GB of =
data
onto that array, and will run some more stress-tests to verify its
stability. So far (200GB into the copy-operation) everything looks good.

/Daniel Eriksson




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