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From Axel-Stéphane SMORGRAV <Axel-Stephane.SMORG...@europe.adp.com>
Subject RE: [users@httpd] Investigating high harddrive load
Date Mon, 01 Oct 2007 08:39:19 GMT
Somebody is probably reformatting your hard drive.

No, seriously you need to provide a LOT more information about your configuration for anyone
to get the foggiest idea about what causes this.

What HW/OS? Are these disk reads or writes? What kind of modules do you use? PHP or no PHP?
etc.

I once observed really poor performance on a server during a load test due to disk IO and
associated wait-times. The IO operations were disk writes which was bizarre because nothing
was supposed to be written to disk. It turned out being mod_ssl writing to the DBM-based SSL
session cache. After changing it to shm the problem went away...

-ascs
 
-----Message d'origine-----
De : Samuel Vogel [mailto:samy-delux@gmx.de] 
Envoyé : samedi 29 septembre 2007 17:09
À : users@httpd.apache.org
Objet : [users@httpd] Investigating high harddrive load

Hey people,

I would like to know if there is any way to debug what vhost is causing the high load on my
harddrive, that I'm experiencing.
To be more specific:
When I run "top", 80% of my CPU time is in i/o wait. How could I find out, what vhost is causing
this?

Regards,
Samy

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