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From: Joachim Tingvold <joachim@tingvold.com>
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To: Alexander Motin <mav@freebsd.org>
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Subject: Re: mps0-troubles
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On Wed, Jan 12, 2011, at 14:19:01PM GMT+01:00, Alexander Motin wrote:
> dmesg you've shown shown many command timeouts on multiple devices. As
> soon as default ATA timeout is about 30 seconds - it may cause
> significant delays before recovery sequence will manage it. That could
> result in delays you observed.

I let the computer stay on for about 7-8 hours after I sent my  
previous email, and it was still frozen. I had to physically reset the  
computer to get it operational again.

> What's more suspicious is that timeouts happened same time on
> AHCI-attached disk and several disks on mps controller. I can hardly
> assume that two completely different controllers and drivers triggered
> some unrelated problems simultaneously.

If I were copying from the AHCI-attached disk to the mps controller,  
and the AHCI-attached disk timeouts, wouldn't this cause the disks on  
the mps controller to timeout as well?

-- 
Joachim