BlueCat Crossover High Availability (xHA) provides disaster recovery through the use of redundant servers: xHA makes two DNS/DHCP Servers function as a single server. If one of the servers fails for any reason, the other takes its place and continues providing services.
The pair appears as a single server for DNS queries because both servers share an IP address. Each server in the pair has its own IP addresses for management through Address Manager.
Supported xHA pairs
|Hardware appliance 2||Virtual machine 2|
|Hardware appliance 1||xHA supported||xHA not supported|
|Virtual machine 1||xHA not supported||xHA not supported*|
Supported xHA configurations
|Physical pair||Virtual pair|
|xHA Backbone connection between pair (eth1)||Highly recommended||Highly recommended|
|Different software versions on each node||Not supported||Not supported|
|Different architecture on each node||Not supported||Not supported|
|w/ non-BlueCat failover enabled**||Not supported||Not supported|