Hi,
The idea was to have two identical (well, nearly identical) servers with
the same software and data on them, and while the first do its job as
SMTP and POP3/IMAP4 server, the second server just get copy of first's
current state (that is, copy user db and mail spool). In case of
something wrong with 1st server I'll just put its IP on second one and
will go on.
Use Heartbeat and DRBD for replication - all mail is synched between the
servers.
If first crashes, heartbeat runs "second" as new server for the users.
As dovecot on "second" is only started if "first" is down, there are no
issues about inconsistencies.
best regards,
Anton
