How to replicate MAIL BOX server via RHCS ?

Hello All,

I am in the process of setting up Zimbra 7.2 network edition in a Red Hat cluster environment.

I will be using 4 individual servers as follows :

a) Firstly the 2 servers on top will be housing both LDAP and MTA, i.e LDAP replication.
b) Secondly, 2 servers for Mail Box and both these are in RHCS cluster
c) Finally the Storage

Now i need to setup replication between Mail Box servers, and i am not sure how to go ahead :(

Can anybody on the board assist me with this, Please ?

Thank you