[PLUG] Email server performance
Robert Anderson
riznob at gmail.com
Fri Apr 15 17:59:31 UTC 2005
Hi All, I am having some email server performance issues. Users report
that the performance is horribly slow. I have witnessed this poor
performance. It is only horribly slow during business hours, when
everyone is using it. There are about 180 users who mostly use imap to
access email. The machine seems to have plenty of processing power, 4
Zeons and 4 gigs of ram. I wrote a script to collect some data every
hour. The script collects output from top, vmstat and ps. I noticed
from the vmstat output that there seems to be a lot of disk io, but it
does not appear to be due to swapping. Here is some output from
vmstat:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 1 57628 14908 218568 1494248 0 0 768 2812 703 52 0 1 99
0 4 1 57628 14968 218568 1494248 0 0 768 1824 796 103 1 1 97
0 4 5 57628 15156 218572 1493808 0 0 1536 1800 653 134 0 1 99
0 3 1 57628 17176 218572 1499476 0 0 10880 452 438 482 1 3 96
Any ideas of how I could address the performance problems? Should I
switch the users to pop3? Put a cap on mailbox size? Any help is
appreciated.
--
Rob Anderson
riznob at gmail.com
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