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When I perform the command

iostat -x | grep -P 'Device|x.\s'

I get the following columns as output

device rrqm/s wrqm/s r/s w/s rsec/s wsec/s avrq-sz avqqu-s await svctm %util

What does each of these column mean?

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up vote 5 down vote accepted

I know RTFM is not the answer you are looking for, but this time it is appropriate. Try man iostat, all the values are explained there. In case you are somehow missing the man pages, here's a webified version, although your Linux distribution might have a more current version of that man page.

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+1, Most of the time "Read The Friendly Manual" isn't the best response; but sometimes people are just lazy, and lazy questions deserve lazy answers. – Chris S Aug 24 '10 at 12:58
Agreed, and I couldn't explain the columns better than the man page, so linking to man page was a perfect answer this time. :-) – Janne Pikkarainen Aug 24 '10 at 13:00
In my defense, I don't have a linux distribution and I just had to do a brief analysis of a log file that I got using iostat. I got my answer, so I cannot complain ;) – Chandam Aug 24 '10 at 15:40

see man 1 iostat. there is a list of all columns with explanations

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