What do the columns in you get from iostat mean?

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?

From serverfault Chandam

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

  http://linux.die.net/man/1/iostat

  From krissi

• 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.

  Chris S : +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.

  Janne Pikkarainen : Agreed, and I couldn't explain the columns better than the man page, so linking to man page was a perfect answer this time. :-)

  Chandam : 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 ;)
  From Janne Pikkarainen