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|Oracle Fusion Middleware Deployment Planning Guide for Oracle Unified Directory 11g Release 1 (11.1.1)|
In a deployment of Oracle Unified Directory proxy using distribution with failover load balancing between two data centers, the data is split into partitions, where each partition is managed through a failover load balancing route. As illustrated in Figure 7-5, not only are the remote LDAP servers holding the partitioned data replicated within the data center, but in addition, the data centers are replicated, with one of the two acting as the backup.
Figure 7-5 Distribution with Failover Between Data Centers
In other words, requests sent to the Oracle Unified Directory proxy deployed with this configuration are first distributed to the partition in which the data is stored. For example, a request for data Garry would be forwarded to partition 1. The failover load balancer then forwards the request through the main route, depending on the load balancing algorithm set, to one of the one of the remote LDAP servers holding the data for A..L.
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In the deployment illustrated in Figure 7-5, Data Center 2 acts as a backup, and is only used on failure of the first data center. However, this same deployment could be configured to use saturation, rather than a failover load balancer. This way, if Data Center 1 in one geographical location (for example in one time-zone) becomes saturated, the other data center can pick up the excess traffic.
The advantages of this deployment are the speed of the reads through the distribution algorithm, and the high availability offered since the remote LDAP servers are replicated, and one data center acts as a backup.
For more information on the different distribution algorithms, see Data Distribution Using the Proxy.
For more information on the different load balancing algorithms, see Load Balancing Using the Proxy.
For details on deploying this configuration, see Configuring Distribution with Failover Between Data Centers.