[Dovecot] Questions about Proxy/Director (was: Re: Indexes to MLC-SSD)

Jan-Frode Myklebust schrieb:

Yes, and in ascii-art this becomes :-)

MTA -(lmtp)--> dovecot-director ---(lmtp)---> backend-server1 \---(lmtp)---> backend-server2

IMAP-user -(imap)--> dovecot-director --(imap) --> backend-server1 \--(imap) --> backend-server2

I failed creating a nice ascii view ;-)

However, I have some more questions:

• What happens if the MTA accepted a message but the backend-server fails and is unable to store it?

• What about load-balancing and/or failover? Maybe all users on backend-server1 are fetching their mails causing high load while backend-server2 is idle. Is it possible to specify more than one backend-server IPs as I can do for the database hosts for userdb queries?