Trying Dovecot Replication with dsync

[Listas@Adminlinux]

Hi,

I have a failover cluster for mail server with:
Ubuntu12.04 + DRBD (for block replication) + Ext4 filesystem
+ Dovecot-2.0.19-2 with Mdbox

It works fine with ~50k accounts. My cluster design: 
http://adminlinux.com.br/cluster_design.txt

I plan to test Dovecot Replication with dsync to build an active/active 
cluster with load balancing. Can anyone direct me to some literature? A 
tutorial for example.

I'm installing a cluster (for tests) with Ubuntu 14.04 + Ext4 filesystem 
(without Drbd) + Dovecot-2.2.9-1ubuntu2.1. My conf is in: 
http://adminlinux.com.br/replication-doveconf.txt

I'm following this doc http://wiki2.dovecot.org/Replication but I'm 
getting some errors:

1)
Aug 14 15:39:34 ceph1 dovecot: imap(account=domaintest.com): Error: 
open(/var/run/dovecot/replication-notify-fifo) failed: Permission denied

What is the correct perms for /var/run/dovecot/replication-notify-fifo ? 
Currently:
# ll /var/run/dovecot/replication-notify-fifo
prw------- 1 root root 0 Aug 14 15:57 
/var/run/dovecot/replication-notify-fifo|

2)
Aug 14 16:02:34 ceph1 dovecot: dsync-server(account=domaintest.com): 
Error: Couldn't create lock 
/var/lib/imap/account=domaintest.com/.dovecot-sync.lock: No such file or 
directory
Aug 14 16:02:34 ceph1 dovecot: dsync-local(account=domaintest.com): 
Error: Couldn't create lock 
/var/lib/imap/account=domaintest.com/.dovecot-sync.lock: No such file or 
directory

In my production cluster, it is automatically created by dovecot when 
the user performs the first login:
/var/lib/imap/<account> for INDEX
/var/spool/imap/<account> for Mdbox

Thanks!
--
Thiago Henrique