From: Francisco Reyes (listsstringsutils.com)
Date: Mon Oct 02 2006 - 09:55:10 CDT

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Adrian Ulrich writes:

> Are you using Linux or *BSD?

FreeBSD 6.1
 
> Running something like iostat (Solaris /BSD?) or sysstat (Linux: http://perso.orange.fr/sebastien.godard/)
> could give you a clue about how busy your Raid-system is:

Have used iostat and I see lots of small transactions.

> If sysstat/iostat shows high svctm/%util

What do you mean by "svctm/%util"?

> Otherwise your SQL-Server may be the bottleneck.

Eliminated 2 of the 3 SQL lookups and plan to remove the 3rd today.
 
> You could try to decrase the number of smtpd processes (master.cf) or
> play with *_destination_concurrency_limit on your frontend servers.

Ideally I would like to decrease incoming mails only to these two machines.
Other machines are fine.
  

> How about spreading the heavy-domains across multiple backends?

We have 4 mailstores. These two have the better hardware so we moved the
heaviest smtp traffic domains to these two machines. I am still trying to
convince the powers that be.. to get a SCSI setup for these domains.

> You are using Maildir, correct?

Correct. Maildir run off Courier IMAP, serving imap and pop3.

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