Replication only sporadic

Lucas Rothamel - Eye Catching Webdesign info at
Fri Oct 24 19:02:09 UTC 2014

Hello dear Dovecot Gurus,

I am setting up two servers with Dovecot replication as hot-standby 
servers for a small high availability cluster, switch-over through 

For testing purposes, both servers are generating a small test mail 
every few minutes and delivering to the local dovecot each. In my mail 
client, I added both servers through IMAP to watch how the replication 
is working. However, I noted that replication is very sporadic: 
sometimes a new email is received "instantaneous" by both servers, then 
no replication updates are visible for hours, and suddenly all missing 
mail appear in the other server.

Why is this? Can this be changed to be more realtime?

Thank you!

doveconf -n:
# 2.2.14: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.7 ext4
auth_mechanisms = plain login cram-md5
disable_plaintext_auth = no
info_log_path = /var/log/dovecot-info.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_debug = yes
mail_location = maildir:/home/%d/%n/Maildir
mail_plugins = " notify replication"
mail_privileged_group = mail
passdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
plugin {
   mail_replica = remote:vmail at ...
   quota = maildir:User quota
   quota_rule = *:storage=1GB
   replication_full_sync_interval = 1 hours
protocols = imap pop3
service aggregator {
   fifo_listener replication-notify-fifo {
     mode = 0600
     user = vmail
   unix_listener replication-notify {
     mode = 0600
     user = vmail
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   user = root
service config {
   unix_listener config {
     user = vmail
service doveadm {
   user = vmail
service replicator {
   process_min_avail = 1
ssl_cert = ...
ssl_key = ...
userdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
protocol imap {
   mail_plugins = quota imap_quota
protocol pop3 {
   mail_plugins = quota
   pop3_uidl_format = %08Xu%08Xv
protocol lda {
   info_log_path = /var/log/dovecot-lda.log
   mail_plugins = quota
   postmaster_address = ...

Lucas Rothamel
Eye Catching Webdesign
info at -

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