[Dovecot] Performance of Maildir vs sdbox/mdbox

[Timo Sirainen]

On Wed, 2012-01-18 at 23:21 +0800, Lee Standen wrote:
> Out of interest, has the NFS issue been tested on NFS4?  My 
> understanding is that NFS4 has a lot of fixes for the locking/caching 
> problems that plague NFS3, and we were planning to use NFS4 from day 
> one.

I've tried with Linux NFS4 server+client a few years ago. It seemed to
have all the same caching problems as NFS3.

> If this hasn't been tested, is there some kind of load simulator that 
> we could run to see if the issue does occur in our environment?

http://imapwiki.org/ImapTest should easily trigger it. Just run it
against two servers, both hammering the same mailbox.