Update the node list

An HP NNM Adapter component, the NgNnmDwProvider, controls the time interval and the number of threads used to collect the node data from NNM for Windows. You can configure the update interval and the number of threads with the appropriate registry keys. The default update value is one hour. The default number of threads is 40.

NOTE:
If you prefer, you can start an update manually using the DwRefresh.exe tool described in the "HP NNM Adapter Utilities" help topic.

When updating starts, the NgNnmDwProvider creates many check threads which update the NgNnmDwProvider. Each check thread takes one node from NNM for Windows; a greater number of check threads means a shorter time to update NgNnmDwProvider. Updating with one check thread requires about twice the time required when updating with two check threads. However the difference between 40 and 80 check threads may be as low as 10%.

The NgNnmDwProvider can operate in two modes:

• Gathers information about nodes only from NNM

  NNM recognizes an operating system on the node only if SNMP is installed on it. If you filter nodes based on operating system equals Windows, only nodes with both Windows and SNMP installed on them will be found.

• Gathers additional information (including that from NNM) directly from nodes using WinNet calls (detects Windows nodes and OS version). To keep network traffic to a minimum, information about nodes is cached, so each node is contacted only once.

  If you filter nodes based on o perating system equals Windows, all nodes with Windows are found, whether they have SNMP installed on them or not. This is the default mode.

  NOTE:
  NgNnmDwProvider mode does not affect filtering based on operating system other than Windows 2000.

To change the number of check threads

1. Run the registry editor on the NNM for Windows computer with this command:

   Start Run regedit OK

2. In the Registry Editor, go to this location:

   HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard\OpenView\NNMAdapter\NgNnmUpdater\Repl\CheckThreads

3. Double-click the property labeled CheckThreads to open the Edit DWORD Value dialog box for CheckThreads.
4. Enter a new value for the number of check threads to be used.
5. Click OK to confirm the change and close the dialog box.

The new check threads value takes effect after you restart the NGNnmDwProvider service.

To change the update interval for NgNnmDwProvider

1. Run the registry editor on the NNM for Windows computer with this command:

   Start Run regedit OK

2. In the Registry Editor, go to this location:

   HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard\OpenView\NNMAdapter\NgNnmUpdater\Repl\UpdateInterval

3. Double-click the property labeled UpdateInterval to open the Edit DWORD Value dialog box for UpdateInterval.
4. Enter the new update interval in seconds.
5. Click OK to confirm the change and close the dialog box.

To change the mode of operation

1. Run the Registry Editor on the NNM for Windows computer with this command:

   Start Run regedit OK

2. In the Registry Editor, go to this location:

   HKEY_LOCAL_MACHINE\SOFTWARE\Hewlett-Packard\OpenView\NNMAdapter\NgNnmUpdater\Repl\AdditionalChecking

3. Double-click the property labeled AdditionalChecking to open the Edit DWORD Value dialog box for AdditionalChecking.
4. Type 0 to gather data only from NNM; type 1 to perform additional checking on nodes.
5. Click OK to confirm the change and close the dialog box.
6. Stop the NgNnmDwProvider service.
7. Delete <HP BTO product base dir>\Installed Packages\{c9322d6f-d88c-11d3-98e3-o80009ef5c3b}\data\NgNnmPreviousNodes.bin file
8. Start the NgNnmProvider service.

• HP NNM Adapter Utilities