Brad Campbell wrote:
> [...]
> Actually, I'm not sure without the libata dev patch as that removes SMART 
> support, and I'm not 
> convinced that my smartd polling every 20 minutes does not have something to 
> do with it. All I know 
> is the older kernel seems to cope. We'll see. 320 minutes left on this 
> rebuild. I expect it will be 
> done in the morning if all goes according to plan. (With the 2.6.11 kernel it 
> never survived past 
> about 25% rebuilt)

Can you find time to try it without smartd active ?
You report running a uni-processor system, and I have only
seen PIO problems with (fast) SMP systems in my testing,
but I am forming the opinion that libata-PIO functions
are in need of a minor overhaul.

I have seen issues where port activity monopolised
data-paths/arbitration inside chipsets such that the
PIO operations would appear to time out. Since you're
doing a raid rebuild, perhaps the I/O load is causing
something similar to occur.
-- 
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Andy Warner             Voice: (612) 801-8549   Fax: (208) 575-5634
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