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Old 02-16-2006, 01:10 AM   #1
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What is iowait?

Can someone tell me what is iowait and what is it's purpose on a server?
Old 02-16-2006, 07:34 PM   #2
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As far as I know it's the time that the CPU sits idle waiting for disk I/O to complete. It's a performance statistic, but not one I know much about.
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Old 07-27-2010, 06:23 AM   #3
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Percentage of time that the CPU was idle during which the system had an outstanding disk I/O request.

You can get the %iowait using the following command.

# mpstat


# iostat


# sar



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