High Availability and Failover Capabilities in Oracle Internet Directory

Multimaster replication makes it possible for the directory system to be available for both access and updates at all times, as long as at least one of the nodes in the system is available. When a node comes back online after a period of unavailability, replication from the existing nodes will resume automatically and cause its contents to be synchronized transparently.

Any directory system with high availability requirements should always employ a network of replicated nodes in multimaster configuration. A replica node is recommended for each region that is separated from others by a relatively low speed or low bandwidth network segment. Such a configuration, while allowing speedy directory access to the clients in the same region, also serves as a failover arrangement during regional failures elsewhere.