A global administrator is created when replication is enabled and is responsible for managing configuration server groups.
A configuration server group is an administration domain that allows you to synchronize configuration changes to one or all of the servers in the group. For example, you can set up a group when configuring a replication topology where configuration changes to one server can be applied to all of the servers at a time.
Global administrators are stored in the topology registry. These entries are always
mirrored between servers in a topology. Global administrators can be assigned privileges
like other administrator users but are typically used to manage the data under
cn=config. You can create
new or remove global administrators using the dsconfig tool. The global
administrator entries are located in the
cn=Topology Admin User,