dovecot - Mar 2011 - dovecot proxy, imapproxy, perdition . . . or?

Hi,

I have two load-balanced dovecot servers using a single NFS
mount. The version is 1.2.11. I chose this so that if one server
goes down the other will take up the load, and if my load is
too much for one server I just have to add more identical
servers. It works, but I wish to move to SAN storage because
the NFS server is exhibiting irregular performance. (I spent a
lot of time with tcpdump to check that it wasn't NFS locking
problems). Performance is very important to me, not in the sense
of many users but in the sense of quick response time, since the
main use is as a webmail backend.

That means that instead of load-balancing connections between
servers I will have to partition users between servers (all on
one to begin with) and direct users to the corresponding server.

I expected to use perdition, but when reading up on that I
found imapproxy, which could be interesting for performance
reasons, and also that dovecot has an included proxy, and
that its performance is better than perdition. However on
http://wiki.dovecot.org/HowTo/ImapProxy the feature "IMAP/POP3
server with proxy feature" is noted as "This model is still a
bit unfinished in current code."

Is this still true? There's also a general note that "This page
was written quite a long time ago and may not match reality
anymore" . . .

On Sat, Mar 19, 2011 at 09:50:15PM +0100, Lorens Kockum
wrote:
> Hi,
> 
> I have two load-balanced dovecot servers using a single NFS
> mount. The version is 1.2.11. I chose this so that if one server
[..]
> reasons, and also that dovecot has an included proxy, and
> that its performance is better than perdition. However on
> http://wiki.dovecot.org/HowTo/ImapProxy the feature "IMAP/POP3
> server with proxy feature" is noted as "This model is still a
> bit unfinished in current code."
> 
> Is this still true? There's also a general note that "This page
> was written quite a long time ago and may not match reality
> anymore" . . .
I use 1.2.15 from Debian Lennys backports in a proxy configuration
for a medium three digit number of users without any problems.

Dennis

We use proxy_maybe across several servers handling over 10,000 accounts with no
problems.

------Original Message------
From: Dennis Guhl
Sender: dovecot-bounces+jkrejci=usinternet.com at dovecot.org
To: dovecot at dovecot.org
ReplyTo: dovecot at dovecot.org
Subject: Re: [Dovecot] dovecot proxy, imapproxy, perdition . . . or?
Sent: Mar 19, 2011 4:32 PM

On Sat, Mar 19, 2011 at 09:50:15PM +0100, Lorens Kockum
wrote:
> Hi,
> 
> I have two load-balanced dovecot servers using a single NFS
> mount. The version is 1.2.11. I chose this so that if one server
[..]
> reasons, and also that dovecot has an included proxy, and
> that its performance is better than perdition. However on
> http://wiki.dovecot.org/HowTo/ImapProxy the feature "IMAP/POP3
> server with proxy feature" is noted as "This model is still a
> bit unfinished in current code."
> 
> Is this still true? There's also a general note that "This page
> was written quite a long time ago and may not match reality
> anymore" . . .
I use 1.2.15 from Debian Lennys backports in a proxy configuration
for a medium three digit number of users without any problems.

Dennis


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