[clue-tech] Tracking disk i/o by process?

[Dan Poler]

On Mon, 2007-12-03 at 17:01 -0700, Dan Harris wrote:
> I'm troubleshooting a server that is suffering from some annoying i/o  
> write storms and trying to track down which processes are to blame.
> 
> Does anyone know of a way to track the number of read/writes and  
> summarize them by pid?  dstat shows when it's happening, but doesn't  
> show us *which* processes are responsible. which is not very helpful.

SystemTap is your friend. http://sourceware.org/systemtap/ -- it's a
somewhat C-like scripting language that lets you hook into the kernel
and say be notified on each disk write, or print the top ten processes
from the perspective of I/O activity. It's extremely powerful, but
you'll have write a script to gather the data that you want to see;
fortunately lots of examples are provided (at least with the RHEL/Fedora
version), and the above site has a wiki with lots of other examples.

dap

> -Dan
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-- 
Dan Poler, RHCE
Senior Consultant
Red Hat, Inc.
E-Mail: dpoler at redhat.com

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