Words by Andy Dills [Wed, Mar 05, 2008 at 11:23:08AM -0500]:
So, to follow up to my previous thread, we just successfully migrated our NFS-based mail cluster from qmail pop, courier imap, and bincimap to dovecot 1.1rc1.
Overall the transition was very smooth, the only unexpected adjustment was having to implement ntpd on each box, rather than doing an hourly ntpdate against our local ntpd server, to prevent dovecot from crashing itself from too much drift.
The impact has been severe! Even with NFS-stored indexes, our netapp is seeing 1/6th of the NFS ops per second, and its CPU utilization is now at 1/3rd previous levels.
Yeah. We went from a solution like yours to a based on dovecot imapd and we reduced the servers in 1/3 and the server load to half. Pretty impressive :)
-- Jose Celestino
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"If you would have your slaves remain docile, teach them hymns." -- Ed Weathers ("The Empty Box")