Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the logical and physical disk performance counters are disabled:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Perfdisk\Performance\Disable Performance Counters

If the Exchange Server Analyzer finds the value for Disable Performance Counters present and configured with a value of 1, a warning is displayed.

There are two types of disk-related performance counters that are published on a server computer running a Microsoft Windows® operating system:

The most common way to disable Win32/WMI counters is by using the Extensible Counter List tool (ExCtrLst.exe). This graphical tool, which is available with both the Windows 2000 Server and Windows Server 2003 Resource Kits, enables an administrator to selectively enable or disable the publishing of performance objects. When ExCtrLst.exe is used to disable a performance object, it adds the Disable Performance Counters entry to the registry and configures it with a value of 1. If ExCtrLst.exe is then used to re-enable a disabled counter, it changes the value for Disable Performance Counters to 0. (Note that it does not delete the Disable Performance Counters entry.)

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 correct this warning

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

  2. Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\Perfdisk\Performance

  3. In the right pane, double-click Disable Performance Counters and set it to a value of 0. Alternatively, you can delete the Disable Performance Counters entry to re-enable the counters.

  4. Exit the registry editor and restart any application that collects performance data for the change to take effect.

For more information about ExCtrLst.exe, see "Exctrlst.exe: Extensible Performance Counter List" (