Topic Last Modified: 2008-12-09

The Microsoft Exchange Analyzer Tool reads the following registry entries to determine whether the Microsoft Exchange Server User Monitor (ExMon) tracing is correctly enabled for the target server.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\RpcEtwTracing

HKLM\SYSTEM\CurrentControlSet\Control\WMI\ HKLM\SYSTEM\CurrentControlSet\Control\WMI\Trace\UsePerformanceClock

A value of anything other than 1 for the RpcEtwTracing and UsePerformanceClock values indicates that ExMon tracing is not enabled correctly on the target server and you cannot collect data samples.

The Exchange Analyzer uses the ExMon tool to determine whether a user or a process (or a group of users or processes) is the cause of a disproportionately large percentage of the current server load.

If the Exchange Analyzer determines that ExMon tracing is not correctly enabled for the target server, the Exchange Analyzer displays an error message.

You must correctly enable ExMon tracing by setting the values of these entries to 1 and then restarting the Exchange store service.

Note:
Setting the RpcEtwTracing value to 1 will cause the Exchange Analyzer to display a nondefault configuration message. The Exchange Analyzer reports this configuration for information only and no action is required.
Important:
This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.
To create or edit the RpcEtwTracing sub key

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS and right-click ParametersSystem.

  3. To create the RpcEtwTracing value:

    1. Point to New, and then click DWORD Value.

    2. For the new value name, type RpcEtwTracing.

    3. Double-click RpcEtwTracing. In Value data, type 1.

    4. Click OK.

  4. To edit the RpcEtwTracing value:

    1. Double-click RpcEtwTracing. In Value data, type 1.

    2. Click OK.

  5. Close Registry Editor.

  6. Restart the Microsoft Exchange Information Store service for the changes to take effect.

To create or edit the UsePerformanceClock sub key

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\SYSTEM\CurrentControlSet\Control\ and then right-click WMI.

  3. To create the Trace key:

    1. Point to New, and then click Key.

    2. For the new key name, type Trace.

    3. Right-click Trace, point to New, and then click DWORD Value.

    4. For the new value name, type UsePerformanceClock.

    5. Double-click UsePerformanceClock. In Value data, type 1.

    6. Click OK.

  4. To edit the UsePerformanceClock value:

    1. Double-click UsePerformanceClock. In Value data, type 1.

    2. Click OK.

  5. Close Registry Editor.

  6. Restart the Microsoft Exchange Information Store service for the changes to take effect.

For more information about Microsoft Exchange Server User Monitor, see http://technet.microsoft.com/en-us/library/bb508855(EXCHG.65).aspx.