Hi Tren,

Thank you!

I´m testing the sysstat


----- 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
           total   10,8%    0,0%    1,0%   0,0%     0,2%   84,8%
           cpu00   25,1%    0,0%    0,5%   0,0%     0,1%   74,0%
           cpu01   12,1%    0,0%    0,9%   0,0%     0,3%   86,4%
           cpu02    4,3%    0,0%    1,7%   0,0%     0,1%   87,8%
           cpu03    1,5%    0,0%    0,7%   0,0%     0,3%   91,2%


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.



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