We are planning to migrate postfix/dovecot mail system to Zimbra by this way:
user goes to a virtual IP between 2 balancing servers with heartbeat & ldirector. Those balancing servers will balance 2 SMTP servers with shared virtual IP (active / active) and also will balance 2 identical mailboxes with DRBD and importing disk from NFS or a future ASN. This will give us HA and redundancy. And at the end 2 LDAP (master/slave)
Balancing servers and SMTP goes to DMZ and mailboxes/LDAPs will be on intranet.
As you see we want all redundant and I'm wondering if LDAP should be redundant too or with LDAP replica is enough. I suppose if master LDAP goes down then LDAP replica could be master with a few steps... :?
What do you think guys? Did you understand?