Global Telco, a large company with 500,000 employees world-wide, is using Sun Java System Identity Manager (Identity Manager) to support users between Active Directory, Directory Server, Oracle RDBMS, Novel NDS, and other systems. The company has two main data centers: one in the United States, and one in Europe.
The company has a single Active Directory domain (gt.com) with four domain controllers, and a Sun Java System Directory Server deployment (dc=gt,dc=com) with four preferred Directory Servers and four read-only replicas.
The Sun Java System Directory Server topology includes four preferred Directory Server and four master replicas. Directory Server is the corporate directory server used to control access to web-based applications. The directory server has a single root suffix, dc=gt,dc=com. Information about users is stored in the ou=people, dc=gt,dc=example,dc=com container with uid as the naming attribute.
Two preferred Directory Server and two master replicas are located in the United States (a separate configuration directory in the United States stores configuration information for these systems).
Two preferred Directory Server and two master replicas are located in Europe (a separate configuration directory in Europe stores configuration information for these systems).
Identity Synchronization for Windows treats hub replicas the same as read-only replicas. In many scenarios, using a hub replica is preferred to using a read-only replica because a hub can be easily promoted to a preferred Directory Server.
The Active Directory deployment has a single domain, gt.com, with two domain controllers located in the United States and two in Europe. The user information is stored in the standard cn=users container in Active Directory (cn=users,dc=gt,dc=com).
Both ad1-us.gt.com and ad3-eu.gt.com are bridgehead servers that control replication between the two sites.