Am 05.03.2011 14:13, schrieb Stan Hoeppner: > Reindl Harald put forth on 3/5/2011 6:02 AM: > > Thanks for the info. Need one clarification: > >>> Can you cluster the dbmail IMAP daemon on multiple external hosts to >>> support thousands of concurrent IMAP users, without the locking >>> contention of NFS or cluster filesystems, thus achieving lower latency >>> and greater throughput? >> >> yes you can because you have only to install dbmail/postfix on all >> of them with access to the same database, for postfix you >> can use replication-slaves too as fallback > > I asked about multiple IMAP servers and you answered with Postifx, which > is an SMTP server, not an IMAP server.
it seems you did not read i answered with "dbmail/postfix" dbmail = imap/pop3/lmtp/sieve postfix belongs to my answer because i would use one big db-server and on the mail-hosts postfix/dbmail-imapd/dbmail-pop3/dbmail-lmtpd sahring the same database and the point is that you can use all this hosts as mx and imap-host because they have the same data using replication slaves for postfix is nice beacuse you can spread the read-only-load away from the main-db-server > In the Dovecot world, for a high availability and high concurrent user > load cluster, one may setup say, 12 low end 1U rack servers with 4GB RAM > and dual GbE ports each, to handle about 5,000 concurrent IMAP users > (~400 users each), with all 12 servers accessing the same high > performance NFS mailstore. and in dbmail you use a hig-performance db-server > Dovecot can't use dbmail for message storage or indexes. dovecot is in context dbmail obsolete but we use it as imap/pop3-proxy and for authentication in front of dbmail because dovecot supports more auth-mechs > My question is how would one build such an IMAP cluster with dbmail? > I would assume a dbmail IMAP server component would need to replace Dovecot > in this setup. Is such a thing possible? yes since dbmail is imap/pop3/lmtp/sieved > Apologies to all as this thread has wandered into OT territory. This is > my last post on the subject. I just wanted to understand if/how dbmail > can scale with both Postfix delivery and IMAP retrieval in a clustered > setup. no problem, you did not realize that dbmail/mysqld is the whole mail-system only needing an MTA like postfix or exim
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