2.5 Two-tier Manager Operation ModelIn this model, a Manager is installed for each section and Enterprise Manager conducts centralized management of the entire system from the Center. By constructing the Manager in two tiers, it becomes possible to manage large-scale systems.
Centralized management of the entire system is normally performed from an operation management client connected to Enterprise Manager. However, it is also possible to manage each section from the operation management clients connected to the Managers while managing the entire system from the operation management client connected to the Enterprise Manage. To do this, parameters must be specified with the two-tier Manager setup command when the environment is created.
The total number of Agents and Proxy Managers that can be managed by a single Manager is about 50.
By splitting the Manager physical disk into summary data, resource data and archive files, the number of Agents that can be managed by one Manager can be extended to approximately 300.
Refer to Section "Changing the PDB/Archive File Storage Location" in the Installation Guide for details on how to split the disk.
And normally a single Enterprise Manager can manage about 10 Managers, meaning that about 500 Agents and Proxy Managers can be managed in a two-tier operation. Further, changing the method of storing the performance data can increase the number of Managers that a single Enterprise Manager can manage. To do this, parameters must be specified with the two-tier Manager setup command. Refer to "3.2.5 Enterprise Manager" for details.
Only the "Push" communication method can be used in this configuration model. Refer to " 2.10.1 Communication mode using the Push method " for details on the push method.
Note
Two Managers performing redundant operations cannot connect to a single Enterprise Manager.
