Sun Microsystems Portal Server 6 - Manual (Page 93)

Working with Portal Server Building Modules
Chapter 5 Creating Your Portal Design 93
No Single Point of Failure
Portal Server natively supports the no single point of failure (NSPOF) scenario.
NSPOF is built on top of the best effort scenario, and in addition, introduces
replication and load balancing.
Figure 5-4 No Single Point of Failure Example
Balancer
Portal
Server
Directory
Server
Master
Replica
Portal
Server
Directory
Server
Master
Replica
Multi-Master
Replication
Instance
Building Module 1
Building Module 2
SSe
Se
s
Search
Engine
Database
SSe
Se s
Search
Engine
Database
Load
Client