Hi Tren,
Thank you!
I´m testing the sysstat
Regards,
Joao
----- Original Message -----
From: "Tren Blackburn" <[EMAIL PROTECTED]>
To: <vchkpw@inter7.com>
Sent: Monday, October 08, 2007 11:51 PM
Subject: RE: [vchkpw] qmail high performance
-----Original Message-----
From: João Luiz - Terra [mailto:[EMAIL PROTECTED]
Sent: Monday, October 08, 2007 3:13 PM
To: vchkpw@inter7.com
Subject: Re: [vchkpw] qmail high performance
Hi Nick.
Thank you.
When concurrent POP3 is low, the loadavg of my server is low too.
My i/o is very high. Is normal?
If any user to connect in POP3, Can he to start a attack to up my I/O?
CPU states: cpu user nice system irq softirq iowait
idle
total 10,8% 0,0% 1,0% 0,0% 0,2% 84,8%
2,9%
cpu00 25,1% 0,0% 0,5% 0,0% 0,1% 74,0%
0,0%
cpu01 12,1% 0,0% 0,9% 0,0% 0,3% 86,4%
0,0%
cpu02 4,3% 0,0% 1,7% 0,0% 0,1% 87,8%
5,7%
cpu03 1,5% 0,0% 0,7% 0,0% 0,3% 91,2%
5,9%
Regards,
Joao
How many hard drives are in this server? Are they in RAID at all? It's
looking that most of your high load average is due to waiting on IO. This
is solved by adding more drives to increase available IO bandwidth. You
should become familiar with two utilities, vmstat and iostat. If you're
using a redhat derived linux, install the sysstat rpm to gain access to
iostat. Between these two utilities you should be able to figure out where
your problems are coming from and how to resolve them.
Regards,
Tren
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