On Tue, Nov 11, 2003 at 11:02:09AM +0100, Thomas Hager wrote: > on another site i'm running a cyrus murder with 2 frontends and 2 > backends handling about 30k users. we have ldap daemons on the backend > used for user authentication/mail routing and mtas on the frontends > handling smtp. > this system handles an average of 8 pop3/imap4 logins per second and > 4000 lmtp deliveries per hour. > but it reaches its limits in very busy hours. usually the cyrus internal > authentication begins to fail. backends and mupdate slaves can no longer > authenticate to the mupdate master and frontend services fail to > authenticate to the locally running mupdate slaves. > > we are scaling now by moving the mtas to dedicated servers and by > removing the mail routing load from the backend ldap daemons.
Very interesting ... I am building a Murder whee we expect a similar load. Could you expand a bit on the hardware used ? Are these machine mostly IO, memory or CPU bound ? Do you have a dedicated MUPDATE master, or the master run on a frontend ? What exactly is failing in the authentication process ? Are you authenticating users via saslauthd ? Have you traced the reason why authentication to the mupdate master fail ? Your experiences could be very valuable to me; I would be very glad if you could share some of them. Thanks ! -- Etienne Goyer Linux Québec Technologies Inc. http://www.LinuxQuebec.com [EMAIL PROTECTED]
