High iowait

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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?

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