Finding out application causing disk/io?

[Andy Green]

Christian Nygaard wrote:
> Howdi I have a server that servers MySQL, Apache and NFS - fairly
> standard stuff :).
> It has sometimes has some occasional load spikes that often last between
> 15min an one hour with load between 5 and 10. I'm running systat and sar
> and iostat, how do I find out just which application is causing the
> disk/io? Got any helpful hints what you would do to find out which of
> the major applications that
> is causing it?

It'll be MySQL doing indexes I should guess.  top should show who is
doing stuff.  There is also a cool "log every io" trick that you can get
working via the "laptop mode" stuff, I did this some time ago but a
Google should find it.

-Andy


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