Host names that are associated with the load balancer VIPs must be identical between the two sites. This requirement exists because these host names appear in the application-level configuration that is shared between sites. Other host names, such as those associated with the various server systems, can differ between sites. However, if the DR site is not redundant (which means it does not use load balancers), the server system host names at the DR site must match the corresponding VIP names at the primary site.
Due to the reuse of certain host names, the system cannot rely entirely on DNS name resolution. The system maintains the mapping of host name to IP addresses in a local hosts file on each system that uses these host names. Additional host name requirements exist if the CSP console system and the Identity Management server are on the same system. The Disaster Recovery Installation section describes these requirements.
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