Sun Microsystems 2005Q1 manual Working with Portal Server Building Modules

Working with Portal Server Building Modules

Redundancy is equally important to the directory master so that profile changes through the administration console or the Portal Desktop, along with consumer replication across building modules, can always be maintained. Portal Server and Access Manager support MMR. The NSPOF scenario uses a multi-master configuration. In this configuration, two suppliers can accept updates, synchronize with each other, and update all consumers. The consumers can refer update requests to both masters.

SRA follows the same replication and load balancing pattern as Portal Server to achieve NSPOF. As such, two SRA Gateways and pair of proxies are necessary in this scenario. The SRA Gateway detects a Portal Server instance failure when the instance does not respond to a request after a certain time-out value. When this occurs, the HTTPS request is routed to a backup server. The SRA Gateway performs a periodic check for availability until the first Portal Server instance is up again.

The NSPOF high availability scenario is suitable to business critical deployments. However, some high availability limitations in this scenario might not fulfill the requirements of a mission critical deployment.

Chapter 5 Creating Your Portal Design 95