On Tue, Mar 23, 2010 at 05:42:02AM -0400, Charles Marcus wrote: > On 2010-03-22 9:31 PM, Stan Hoeppner wrote: > > Dovecot has built in locking support for NFS storage. > > But it has always been problematic, according to Timo.
Have you got any references on this, apart from http://wiki.dovecot.org/NFS ? I'm looking at migrating a courier-imap installation (FreeBSD frontends, Netapp backends, Maildir++) to dovecot. I'd be grateful of any known pitfalls I should be looking out for. I have done some small-scale testing and it looks fine. tcpdumping the NFS traffic, I see that the FreeBSD frontend is sending "access" requests to check that its local cache is not stale. In tests with mailboxes containing 100 messages and a web IMAP frontend (atmail.org), Dovecot was generating about 1/4 of the total NFS traffic compared to courier-imap, because of how Dovecot creates a cache file containing the message headers. I see a link to http://www.freebsd.org/cgi/query-pr.cgi?pr=123755 in the NFS wiki page. Does this problem affect only mbox over NFS, or maildir too? I've not observed any problem with courier-imap, although courier-imap is much dumber about caching, and also at the moment the majority of the userbase are on POP3 anyway. Regards, Brian.
