The figure consists of the following components:
Node1, Node2, Node3, and Node4
Oracle Collaboration Suite Database
Oracle Calendar Server
Node1, Node2, Node3, and Node4 are active nodes. If Node1 fails, then Node2 handles all the requests.
Oracle Calendar Server will store its data on file system residing on shared disk, which is accessed by only one node of the cluster at any given time. So Oracle Calendar Server will only be running on Node1. Only after a failure of Oracle Calendar Server on Node1, Oracle Calendar Server becomes active on cluster Node2.
There is one single Oracle Collaboration Suite Database shared by both nodes.
A hardware load balancer is placed at the front end of the Identity Management nodes.
There are two firewalls shown in the figure. One firewall is for the cluster and the other is for Identity Management tier.
Oracle home #1 and #2 are created for Oracle Collaboration Suite Database. Oracle home #3 and Oracle home #4 are created for Identity Management service. Oracle home #5 and Oracle home #6 are created for Oracle Collaboration Suite Applications. Oracle home #7 is created for Oracle Calendar Server.