The figure shows nodes on two tiers; the tiers are separated by a firewall.
In one tier, you have a node running the database that contains the OracleAS Metadata Repository. You install the OracleAS Metadata Repository first.
In the other tier, you have two nodes running Oracle Delegated Administration Services, OracleAS Single Sign-On, and Oracle Internet Directory.
Each node has local storage. You install the Oracle home for these Oracle Identity Management components on the local storage of each node. The local storage also contains the inventory directory. You install these Oracle homes after you install the OracleAS Metadata Repository.
Both nodes are active. A load balancer directs requests to both these nodes.