on the other server,  under /etc/sysconfig/network hostname field also 
 HOSTNAME=mail.example.com
and /etc/sysconfig/network-scripts/ifcfg-eth0 file 
IPADDR=192.168.0.2is it possible? is it recommend? 
my task is to have 2 zimbra servers with 
mail.example.com with 2 ips 
192.168.0.1 is the primary, I want to 
rsync /opt of this server to the other server 192.168.0.2. 
then, primary fails, I have a backup on the other server. no data lost....
This is what I want to achieve. but, NOT for any kind of ROUND ribbon DNS stuff..
is it possible? is it recommend? 
Pls answer?