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. 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. Dovecot can't use dbmail for message storage or indexes. 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? 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. -- Stan
