Timo / Others,
I have been working on a new installation for a fairly busy site, and after many weeks of tribulation have come to an architecture Im happy with: 2x Debian (2.6.18) - MXing machines running Postfix / MailScanner / Dovecot-LDA (A slightly patched RC17 for prettier Quota bounces) 2x Debian (2.6.18) - Mail retrieval machines running Dovecot IMAP/POP3 (Currently RC17) 3x Node Isilon NFS cluster (NetApp type devices)
I chose Dovecot-LDA over Postfix-Virtual / Maildrop / Procmail due to its
hassle free auto creation of new user maildirs, and the funkyness of built
in Sieve functionality. The on the fly indexing sounded like a bonus at the
time. However as Im sure all people who stress test with index's stored
over NFS find, index locking makes for some 'spectacular crashes' (see
others previous posts).
I have tried out the recommended mount options and locking methods to no
avail. Once under some stress, say ~60 messages a minute from the two front
end machines, understandably the index's get pickled instantly. So as a
hack way around the index locking problems, I have configured the MXing
machines to index locally to no where (/tmp) - and deal with the very
slightly slower IMAP/POP3 performance on the retrieval side.
Is there way to tell/patch Dovecot-LDA not to bother with indexing? So Im not creating unused index files.
Cheers
Dean Manners