The master-subordinate replication model

Replication involves two types of directories: master/peer and replica.

LDAP refers to the master as the master server and to the replica as the replica server. Even when peer-to-peer replication is being used, the peer servers can be considered masters for the ISAM perspective. All updates are made on the master server and these updates are later propagated to the replica servers. Each replica server directory contains a copy of the data in the master server directory.

Changes to the directory can be made only to a master server, which is always used for write operations to the directory. For Security Verify Access, these types of servers are configured as readwrite servers. Either the master or the replicas can be used for read operations. When the original master server is out of service for an extended period, a replica server can be promoted as a master server. The change enables write operations to the directory.

Parent topic: LDAP failover configuration