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Am 11.11.2013 06:24, schrieb Edwardo Garcia:
My company have 36 dovecots, one biggest ISP in country 3 million user, agree with Nick poster, we had stop use dovecot load balance because too bad effect on primary database, now use single localhost, we have script run every 30 second to test login, if fail sleep 30 second, try again, fail and down ethernet interface so hardware load balancer see server not answer and can not use, nagios soon tell us of problem, very very bad and stupid way, but only option is safe, we have look at alternative to dovecot for this and still look, not happy with unreliable softwares to immitate feature.
big network mean big time locate and fix problem when arise so you be good to say no extra point of failure. Too many cog in chain eventually lead to problem.
Wow thats big, and may have implications out of my scope, but database replication is not the job of dovecot, after all why not use loadbalancer like keepalived etc and setup proxies on them so you may combine check feaures from loadbalancers to target related dovecot proxies, which themselves conect to backhand dovecot servers, also its easy to monitor, for sure you may need some shared storage too, which is again not real related to dovecot , i tested ceph , so i think its possible to have seperate mount points with i.e ocfs2 for each domain.
At the end ,for such big setups there should be enough budget to get things solved by hire specialists for each software part which is involved
Best Regards MfG Robert Schetterer
[*] sys4 AG
http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München
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