Quoting Urban Loesch <b...@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?

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