Re: Courier setup for over 17.000 Users [was: Mail clustering]

[Maarten Vink <vink@interstroom.nl>]

Op 4-apr-2007, om 19:54 heeft Michelle Konzack het volgende geschreven:

> > bottleneck I think one server for smtp + pop3/imap is enough and you
>
> And there is the problem!
>
> I have configured ONE inbound "courier-mta-ssl" and curently FIVE
> "courier-imap-ssl" since I have too much $USER accessing the IMAP
> at the same time.  Arround 600-1400 $USER of over 17.000 Accounts
> but increasing.
>
> The mailboxes itself are on 5 seperated NFS-Servers.
>
> I have setup a round robin for <mail.mydomain.tld> for the IMAP
> Servers but it does not realy work, specialy if $USER use the
> Webinterface on <webmail.mydomain.tld> which use 2 Servers currently.

Hi Michelle,

Why don't you add a loadbalancer in front of your IMAP servers, that  
spreads inbound connections based on the load of the machines in the  
cluster? See http://www.linuxvirtualserver.org/ for howto's.

Regards,

Maarten Vink