The Dynamic Cluster environment supports "Shared" or "Cluster-wide" Directory Units. These Units are "visible" on all Cluster members. When Cluster-wide Unit settings are modified via any Cluster member, the new settings are automatically distributed to all other members.
When a Cluster-wide Remote Unit is used on any Cluster member, an outgoing LDAP request is generated directly from that member. All necessary synchronization tasks are performed on the remote LDAP server.
When a Cluster-wide Local Unit is used on the Cluster Controller, the request is performed locally. When a Cluster-wide Local Unit is used on a non-Controller Cluster member, the request is forwarded to the current Cluster Controller using the LDAP protocol (in the same way Remote Units relay requests to remote LDAP servers).
The Cluster-wide Unit data (settings and optional data files) are stored inside the SharedDomains file directory. When the current Cluster Controller stops or fails, and the Backup Controller assumes the Cluster Controller role, it re-mounts all Cluster-wide Local Units, and processes them as regular Local Units, while other Cluster members redirect requests to those Cluster-wide Local Units to this new Cluster Controller.
To create a Cluster-wide Unit, select the Cluster-wide checkbox (it appears in the Dynamic Cluster environment only).