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Date:      Tue, 24 Jul 2012 18:37:05 +0000 (UTC)
From:      jb <jb.1234abcd@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Disk Errors
Message-ID:  <loom.20120724T201915-694@post.gmane.org>
References:  <d65bfc394e4b31d92bb6ab9e8d220d16@dweimer.net>

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dweimer <dweimer <at> dweimer.net> writes:

> ... 
> ad4: TIMEOUT - WRITE_DMA48 retrying (1 retry left) LBA=817755328
> ad4: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request) 
> LBA=837397120
> ... 

There is a story about it:
http://linux-bsd-sharing.blogspot.com/2009/03/howto-fix-sata-dma-timeout-issues-on.html

But do not rush, read the comments as well:
...
"Tony Schwartz said...

    Thing is though, I have a secondary issue. This second issue is probably
what caused the first issue (DMA TIMEOUTS) to begin with. My disks keep
spinning down then up, every 20 seconds or so. I have no idea why this is 
happening, but it's not just one disk. I think that it was timing out because 
he disk goes to spin up and that takes too long. Any ideas here? I've used 
atacontrol and it's not configured to spindown. Thanks."
...
"
Benjamin said...

    LoL, found the solution and feeling a little embarrassed by it. Good thing
I got a GURU in the forums to look at it.

    It was just the power supply and my disk was spinning down cos the power
wasn't sufficient to run 6 HDs and 9 fans for cooling ha ha ha."
...
"
CyberRax said...

    Just for information: while this hasn't been fixed as elegantly as in the
patch FreeBSD does incorporate since 8-STABLE r199158 a solution for the
problem: ATA_REQUEST_TIMEOUT kernel option that be be set higher than the 
default 5.
    What is needed is adding "options ATA_REQUEST_TIMEOUT=X" (where X is
timeout in seconds) into the kernel configuration file.
    Changing the timeout will need rebuilding and installing the kernel, but
it's still better than nothing."

jb





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