[Dovecot] What are the options for HA and\or replication and\or storage?

Patrick De Zordo patrick at spamreducer.eu
Thu Jun 5 15:26:06 UTC 2014

Well, we are trying to do the same, dovecot has this ability, it's called "dsync replication" (http://wiki2.dovecot.org/Replication)
It does his job, since it just sends incremental changes to the peer, so it's very fast and low bandwidth consuming..

But I am having some problems when sieve scripts are being used; I'm trying to understand what could cause the problem..
DRBD in sync configuration could be too slow, in async too dangerous..

> -----Ursprüngliche Nachricht-----
> Von: dovecot [mailto:dovecot-bounces at dovecot.org] Im Auftrag von Eliezer
> Croitoru
> Gesendet: Donnerstag, 5. Juni 2014 17:09
> An: dovecot at dovecot.org
> Betreff: [Dovecot] What are the options for HA and\or replication and\or
> storage?
> I am considering couple options of converting a current service into a HA
> using multi servers or any other solutions.
> The point is that I am thinking about the options and which I am looking for.
> NFS can be a storage which has it's own pros and cons.
> There is the option of DRBD but as of now it's limited for two hosts.
> What options do exist out-there as a solution?
> The main issues are that the current service is based on Maildir and is on one
> server with resierfs.
> The service is composed of one host with 50k users couple disks in raid6.
> On the same machine we have postfix as mailer.
> I would like to hear about HA environment that I can use to replicate the
> boxes.
> My basic research leaded me to smtp on one host or more and using lmtp to
> send the messages to dovecot o another host which will have a replicated
> host and will be used with storage system based on ISCSI or NFS.
> Any other idea to enhance the current one or to replace it is more then just
> welcome.
> Thanks,
> Eliezer

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