On Thu, Jul 31, 2008 at 2:15 PM, Thomas Hummel hummel@pasteur.fr wrote:
Every friday a message (no attachement, decent size) is sent to all users : in such circumstances (but only sometimes, not every time : let's say half the time such a message is sent), the load goes so high that I have to stop dovecot to let procmail deliver the message or even reboot the machine.
Do you use dovecot's delivery agent (LDA)? Dovecot's LDA updates dovecot's cache file correctly. If you use a different LDA, dovecot has to re-read directory contents every time (and update the cache file).
I know multi-master replication is on the roadmap. I know some dovecot sites use in the meantime several dovecot servers. I'd like to know how those sites do the load balancing, the main problem beeing to be able to direct each user to the same dovecot server each time as stated in the Wiki (http://wiki.dovecot.org/NFS).
If you use multiple servers you can use dovecot's proxy-feature to redirect the user to the correct server. You just need a database to tell dovecot (and the MTA) on how to find the correct location for that specific user.
Chris