Ok, just to follow up, it looks like we have resolved this issue.
We removed the Raid 5
We went down to ext2 file system type
We split our 4 disks (yes there was 4, and not 3) into 2 mirror sets.
One housed the OS and the logging directories
The second housed ONLY the exim spool queues.
We have gone from an average of 38 seconds per email to .09 seconds !
-Andy-
_____
From: Andrew Johnson [
mailto:andrew.johnson@sappsys.co.uk]
Sent: 04 November 2004 21:29
To: exim-users@???
Subject: Performance question :-
I'm having a little trouble with performance on one of our email servers :-
Spec :-
HP DL380 Dual 2.4Ghz Processor
4GB Ram
3*36GB 15K RPM Disks in a Raid 5 (64MB read cache)
RedHat Enterprise 3 Linux
Exim 4.41 With exiscan & SpamAsassin compiled in.
Split Spool directories
Exim spool directories are on a seperate filesystem though the raid is
configured as a single disk.
Throughput constant 7000 messages per hour ( ~116 / min)
The system is not CPU bound ~25% cpu usage as an average, neither is it
memory bound. It has 1.6GB Ram free with none of the swap used.
The system takes in an email, uses LDAP to authenticate the user then
delivers it via 2 routers to 2 seperate destinations (one is an archive
server) the other is a content/virus filtering system. Then the message is
passed back to me for final delivery. (The above count of 7000 / hour
includes the message the 2nd time round.)
The issue I have is that between sending the "." at the end of the data and
receiving the 250 message with the spool ID there can be anything from 5 to
30 seconds delay.
The spool queue is ~88MB with around 2500 messages in the queue at any one
time - bounces defered deliveries etc.
Obviously the system is IO-Bound, I was wondering if there was any advice on
how I could reduce this delay.
Thanks..
-Andy-
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