On 18.1.2012, at 19.54, Mark Moseley wrote:
I'm in the middle of working on a Maildir->mdbox migration as well, and likewise, over NFS (all Netapps but moving to Sun), and likewise with split LDA and IMAP/POP servers (and both of those served out of pools). I was hoping doing things like setting "mail_nfs_index = yes" and "mmap_disable = yes" and "mail_fsync = always/optimized" would mitigate most of the risks of index corruption,
They help, but aren't 100% effective and they also make the performance worse.
as well as probably turning indexing off on the LDA side of things
You can't turn off indexing with dbox.
--i.e. all the suggestions at http://wiki2.dovecot.org/NFS. Is that definitely not the case? Is there anything else (beyond moving to a director-based architecture) that can mitigate the risk of index corruption? In our case, incoming IMAP/POP are 'stuck' to servers based on IP persistence for a given amount of time, but incoming LDA is randomly distributed.
What's the problem with director-based architecture?