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Cc: freebsd-geom@freebsd.org
Subject: Re: Low speed disk subsystem after the upgrade 8.1-STABLE-201011
 --> 9-CURRENT
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On 15.12.2010 16:16, Andriy Gapon wrote:
> on 15/12/2010 16:25 Olivier Smedts said the following:
>> 2010/12/15 Vladislav V. Prodan <universite@ukr.net>:
>>> 15.12.2010 15:11, Vladislav V. Prodan wrote:
>>>
>>>> Now try to attach a screenshot.
>>>>
>>>>
>>>
>>> http://img576.imageshack.us/i/dsc00563u.jpg/
>>
>> ad6: TIMEOUT - READ_DMA retrying (1 retry left) LBA=8638372
>>
>> Maybe installkernel/installworld copied files on bad clusters, they
>> were previously bad but you notice only now that there are system
>> files on them...
> 
> This indeed looks like a problem caused by disk.
> There shouldn't have been the panic though ("bio_completed can't be greater than
> bio_length").
> It's a possible geom or ad driver problem.
> What is your geom topology on this system?
> 
> Changing cc: from fs@ to geom@.

Agreed, looks like hardware or driver issue, but AFAIK 8 and HEAD have
pretty much the same ATA drivers, MFC-ed often. Maybe it's something
trivial - nudged cables or a power supply gone accidentally bad.

Just for a test, can you try running with AHCI here? (ahci_load=YES in
loader.conf; note that it will rename devices; don't know if ZFS root
can handle it).