You can configure a proxy server to help make Tivoli® Directory Server highly available with instant failover. A second standby proxy server can be implemented to take over from the primary in the event of a primary proxy server failure.
You can use cluster management software, such as IBM® Tivoli System Automation for Multiplatforms, to automate the failover of the proxy server to the backup proxy server. A shared proxy instance can be used between the proxy servers and mounted on the active server only. You can use a service IP to access the active proxy server, which provides seamless failover when the primary server fails. If Tivoli Directory Server fails, the proxy server automatically reroutes the requests to the second node. Proxy servers can also act as a load balancer, as the directory servers are configured in active-active mode.