Policy Server Guides › Policy Server Configuration Guide › User Directories › LDAP Load Balancing and Failover › Use Case - Load Balancing and Failover

Use Case - Load Balancing and Failover

In this example, a SiteMinder environment contains two user directories, A and B, which must meet the following requirements:

• User directory A must (1) failover to user directory B; and (2) load balance with B.
• User directory B must (1) failover to user directory A; and (2) load balance with and user directory A.

Where spaces represent failover and commas represent load balancing, the requirement is written as:

A B, B A

Solution:

The configuration requires two failover groups.

1. Add user directory B to the first failover group.

   The current configuration is A B.

2. Add a load balancing group.

   Note: load balancing groups open as new failover groups.

3. List user directory B as the first server in the load balancing group.

   The current configuration is A B, B.

4. List user directory A as the second sever in the load balancing group.

The result is two failover groups: "A B" and "B A", which load balance each other. If both directories are available, load balancing occurs between the first directories in each failover group: A and B. If user directory A becomes unavailable, failover occurs to user directory B. This results in user directory B handling all of the requests until user directory A becomes available.