[Dovecot] How can we horizontally scale Dovecot across multiple servers?

Hi,

How can we horizontally scale Dovecot across multiple servers? Do we require to install independent instances of Dovecot on each server?

We are planning to use a NAS/SAN device using ZFS or EFS for email storage. Each logical unit will be of 10TB and similarly as the no: of user increases we are planning to add multiple 10TB units.

In this case how we can manage the email storage on multiple volumes from Dovecot.

The configuration of our existing system is:-

Dovecot 1.0.15 / Maildirs

Postfix 2.5.5

Debian 5.0.9 (Lenny)

MySQL 5.0.15

Please advise.

Thanks in advance.

Creative Regards,

Arlin