On Thu, Nov 24, 2011 at 11:58:01PM +0100, Patrick Westenberg wrote:

What is your frontend configuration?

The frontend is two servers running dovecot director, and ucarp for managing failover ip-addresses.

===================================================================== # 2.0.14: /etc/dovecot/dovecot.conf # OS: x86_64 Red Hat Enterprise Linux Server release 5.x director_mail_servers = 192.168.42.7 192.168.42.8 192.168.42.9 192.168.42.10 192.168.42.11 192.168.42.28 192.168.42.29 director_servers = 192.168.42.15 192.168.42.17 disable_plaintext_auth = no listen = * lmtp_proxy = yes passdb { args = proxy=y nopassword=y driver = static } service anvil { client_limit = 2051 } service auth { client_limit = 4196 unix_listener auth-userdb { user = dovecot } } service director { fifo_listener login/proxy-notify { mode = 0666 } inet_listener { port = 5515 } unix_listener director-userdb { mode = 0600 } unix_listener login/director { mode = 0666 } } service imap-login { executable = imap-login director process_limit = 1024 } service lmtp { inet_listener lmtp { address = * port = 24 } } service pop3-login { executable = pop3-login director process_limit = 1024 } ssl_cert = </etc/pki/tls/certs/cert.ca-bundle ssl_key = </etc/pki/tls/private/cert.key protocol lmtp { auth_socket_path = director-userdb }

How many users do you have that you need that many backend servers?

I don't think I'm allowed to share that externally, sorry. This is the mail-system of an ISP, so we have quite a few users.. :-)

Are your index stored together with the mails?

They're not stored together, because we made the error of not creating a home directory for our users, but both maildirs and indexes are stored on similar cluster fs' (GPFS).

-jf