[Dovecot] Live Mirror dovecot / OS X 10.6.4

[Timo Sirainen]

On Tue, 2010-08-24 at 12:27 -0400, Eric Boltz (MMI/UPC) wrote:
> The idea is to have one as the primary MX ("mail.corp.com") and the other as the secondary ("webmail.corp.com"). If the primary goes down clients would revert to webmail until the primary is back up.
> 
> The plan is to use rsync for this. My challenge, however, is what all I need to rsync to have a "live" backup. Rsync for backup isn't an issue, but I will need to rsync users (system and virtual).

Two potential problems I see with this:

1. If users can do any changes on the secondary server (flag changes,
saving new mails, etc), you're going to have problems syncing the
changes back (without losing any changes or causing other problems).

2. If users can access the secondary server via IMAP clients, the
clients could become confused if the secondary server isn't completely
up-to-date.

With v2.0 dsync would help with the first problem.