[Dovecot] Dsync & random delete problem

Hello,

I've updated my home mail server with dovecot 2.0.11 with idea of using dsync to synchronize two master servers (one at home behind an ADSL connection, and another in a DC with a gigabit connection). Dsync is launched every minutes by a cron job for each hosted mailboxes (in Maildir format). Obviously, a lock prevents to launch more than one dsync process at time.

On a test mailbox, it worked perfectly, but when I decided to use it on my own mailbox: big drama :-).

Some trashed messages reappear after the next sync, by dint of insisting, sometime it are duplicated. Occasionally, the synchronization has the desired effect, but messages reappear few hours later...

So, my questions are:

• Dsync is it supposed to be used to synchronize two mailboxes on continuously?
• Are these problems known? I've found one thread about a random delete problem, so it seem to be? Do you need more informations to debug it?

My informations:

• Dovecot version: 2.0.11
• Distro: Debian Squeeze amd64
• FS: ext4
• Mailbox format: Maildir
• Dsync command: "dsync -u {account} mirror ssh -i /var/vmail/sync/id_vmail -C {dest} dsync -u {account}"
• Bug happen randomly, I haven't found a way to reproduce it.
• Dovecot configuration: A part in particular is interesting?

Thanks in advance,

Antoine Millet http://inaps.org