[Gllug] Poor disk performance on IDE raid

[Chris Bell]

On Thu 02 Jun, Simon Wilcox wrote:
> 
> 
> Hi folks,
> 
> We have several identical 2.8GHz P4 servers running Debian sarge with
> 2.6.8-1-386 kernel and a 3Ware Escalade 7006-2 IDE raid card, with 2 x
> 160Gb IDE drives in them.
> 
> When reading large files, web server logs for example, top shows the
> processor spending about 80% of its time waiting for disk IO.
> 
> This doesn't seem right to me but it is the same on two machines so I
> don't think there's a hardware problem.
> 
> Could anyone offer advice regarding the best place to start diagnosing and
> fixing this problem ?
> 
> Many thanks,
> 
> Simon.
> 
   Which filing system? ext2? ext3? Reiser? Is it very different on write?
I would expect web server logs to be appended/extended frequently, and not
neccessarily contiguous.

-- 
Chris Bell

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