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Re: High iowait


On Tuesday 22 August 2006 04:31, jassduec@xxxxxxxxx wrote:
> I have a storage raid attached to my linux server running CentOS 4.3
> kernel 2.6.9-39.0.2.ELsmp. My server goes into huge iowait when i try
> to read/write lot of data to the storage device. How can i debug
> whether the problem is with the storage device or some setting of the
> operating system. Is there any known issue with this kernel? How can i
> tune my system to reduce iowait time?

Why should you want to reduce the iowait time? Iowait, as shown by top, means 
afaik that there are some processes waiting for io to complete  and nothing 
else to do for the processor.
If you're running some CPU eating processes while your I/O operations are 
performed, then the iowait value should go down (this is because your CPU can 
then do more sophisticated work than waiting)


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