[Dovecot] Architecture for large Dovecot cluster

[Rick Romero]

  Quoting Urban Loesch <bind at enas.net>:

> Hi,
>
>> and some other Dovecot mailing list threads but I am not sure how many
>> users such a setup will handle.  I have a concern about the I/O
>> performance of
>> NFS in the suggested architecture above.  One possible option available
>> to us is to split up the mailboxes over multiple clusters with subsets
>> of
>> domains.  Is there anyone out there currently running this many users
>> on a Dovecot based mail cluster?  Some suggestions or advice on the
>> best way to
>> go would be greatly appreciated.
>
> we only have running a setup with 35k Users (2000 imap and 300 pop3
> sessions simultaneous).
> But we split all users and domains accross 9 virtual containers. Until
> now all containers are running on 1 bare metal machine, because
> the server is fast enough and quite new.
>
> - all Backends are in HA with a passive machine and DRBD with 10GBIT
> Cross Links
>  

How do you do backups?