From: Sandy Drobic (postfix-usersjapantest.homelinux.com)
Date: Sun Oct 01 2006 - 04:55:59 CDT

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Francisco Reyes wrote:
> Sandy Drobic writes:
>
>> Try to find out which process consumes most of the I/O. Is it really
>> the local delivery from Postfix or is it an imap process?
>
> Imap processes.

In that case no fiddling with Postfix settings will alleviate the problem.

>> Are the raid controllers equipped with battery backup units? It helps
>> a lot, if the write cache is enabled
>
> It has and the write cache is enabled.
>
>> has lots of fast cache RAM.
>
> About 128MB of cache. It is a 3ware controller. 9500SX

Increasing the cache size will help a bit, also adding one or two more
hdds to the raid to spread the I/O over more hdds. How many hdds are there
in your raid? Which raid level?

Though I am afraid your system is just overtaxed. In that case you can
probably only decrease the load or increase the system performance with
better hardware.

You need some hard figures to find out if it is sufficient to tweak your
system or you need new hardware. Try "sar" on linux to get continuous
measure of your system load.

Sandy

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