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Date:      Fri, 18 Feb 2005 10:48:07 -0600 (CST)
From:      "Reid Linnemann" <lreid@cs.okstate.edu>
To:        cperciva@freebsd.org
Cc:        "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>
Subject:   Re: ad WRITE_DMA timing out frequently
Message-ID:  <20050218164807.2890AA0637@csa.cs.okstate.edu>
In-Reply-To: <42160FAC.7010807@freebsd.org>

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On 2/18/2005, "Colin Percival" <cperciva@freebsd.org> wrote:

>Reid Linnemann wrote:
>> smartctl doesn't report any logged errors. On a hunch, I also dd'ed a
>> file large enough to fill /var, hoping that it would crater on writing
>> to that sector. It didn't. I know that's not a very useful test, but
>> it seems to hint to me that the disk isn't bad, but the driver is
>> freaking out from some event.
>
>It's quite possible that the driver is at fault, but I'd run a
>"smartctl -t long" test first, just to make sure the drive isn't
>suffering an intermitant fault.
>
>Colin Percival

I ran smartctl -t long on the disk, and sure enough it's healthy:

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining 
LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     22444     
   -

There must be some strange system event happening that is causing the
driver to freak out. I really have a hunch it's related to the msp
queue mail that is being dumped in /var/spool/clientmqueue, because the
that occurance roughly falls in lline with the ad0 failures, and it's
all on the same partition that the error is reported on.


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