IP Failover can be also used in an anycast modality between the two data centers so that visitors will be automatically served by the server located in the nearest data center.
Appliance IP Failover
IP Failover allows to move an IP address form a server to another server in a few seconds. It is useful for projects that need an availability that could’t be obtained with a single server. Through IP Failover you can create a geographic cluster safeguarding services from any interruption, since all server data will be replicated on another server, in another data center.