2.2 Scalability Considerations

Any given Unified Communications Manager device should have only one computer designated as its proxy agent.

In addition, only one computer should act as proxy agent for no more than ten Unified Communications Manager clusters of ten servers per cluster. This number is only a recommendation and can vary based on the capabilities of your proxy agent computer.

The CiscoCM module provides a GeneralCounters Knowledge Script that allows you to monitor an arbitrary performance counter. The scalability of this Knowledge Script is primarily determined by the number of counter instances collected in a single session on the AXL interface. When the instance match results in more than 100 instances, the counter collection uses multiple sessions, which can slow down performance due the Cisco-imposed limit of 50 AXL messages per second.

You may be able to improve the performance of this Knowledge Script, in your environment, by increasing the number of counter instances per message to a value greater than 100.

To change the size of the counter instances per message:

  1. On the management server computer, open the Registry Editor.

    1. For 64-bit navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\NetIQ\AppManager\4.0\NetIQmc\Config

    2. For 32-bit navigate to HKEY_LOCAL_MACHINE\SOFTWARE\NetIQ\AppManager\4.0\NetIQmc\Config

  2. In the right pane, double-click CiscoCM_AXL_MaxCounterDefault.

  3. In the Edit DWORD Value dialog, change the value in the Value data field.

    NOTE:If this value is not present, it defaults to the current value of 100.

  4. Restart any jobs that need to be changed to the new counter collection defaults. The new defaults will not take effect until the job restarts.