Working with Portal Server Building Modules
Transparent Failover
Transparent failover uses the same replication model as the NSPOF scenario but provides additional high availability features, which make the failover to a backup server transparent to end users.
Figure 5-5 on page 96 shows a transparent failover scenario. Two building modules are shown, consisting of four CPUs by eight GB RAM. Load balancing is responsible for detecting Portal Server failures and redirecting users’ requests to a backup Portal Server in the building module. Building Module 1 stores sessions in the sessions repository. If a crash occurs, the application server retrieves sessions created by Building Module 1 from the sessions repository.
Figure 5-5 Transparent Failover Example Scenario
Building Module 1
Load
Balancer
Portal
Server
Instance
Browser
Search
Engine
Database
Building Module 2
Portal
Server
Instance
Search
Engine
Database
Directory
Server
Master
Replica
Replication
Sessions
Repository
