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|Oracle Fusion Middleware Administration Guide for Oracle Unified Directory 11g Release 1 (11.1.1)|
In particularly large topologies, it is often simpler to configure dedicated replication servers (servers that do not include a directory server) and dedicated directory servers (servers that do not included a replication server).
A dedicated directory server contains replicated data but does not contain a change log with the modifications made to that replicated data. A dedicated directory server also has no configured replication port. A dedicated replication server has a configured replication port. The server does not contain replicated data but does contain a change log with the modifications made to the replicated data on other servers in the topology.
Note - Each topology must have at least two replication servers to avoid a single point of failure.
For more information and sample topologies, see Chapter 6, Example Deployments Using the Directory Server, in Oracle Fusion Middleware Deployment Planning Guide for Oracle Unified Directory.
The following diagram illustrates a large replication topology with one dedicated replication server (Replication Server 2), four dedicated directory servers, and one servers that contains both a replication and a directory server (Host 1).
The following example configures replication between Directory Server C and Replication Server 2 in the previous illustration.
$ dsreplication enable \ --host1 host3 --port1 4444 --bindDN1 "cn=Directory Manager" \ --bindPassword1 password --noReplicationServer1 \ --host2 host4 --port2 4444 --bindDN2 "cn=Directory Manager" \ --bindPassword2 password --onlyReplicationServer2 \ --replicationPort2 8989 --adminUID admin --adminPassword password \ --baseDN "dc=example,dc=com" -X -n