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SystemPages Value Is Non-Default on 64-bit Computer

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]  

Topic Last Modified: 2008-04-09

The Microsoft® Exchange Server Analyzer examines the Win32_Processor Windows Management Instrumentation (WMI) class to determine the value for the DataWidth key.

A DataWidth key value of 32 indicates the server is running a 32-bit version of the Windows operating system whereas a DataWidth key value of 64 indicates the server is running a 64-bit version of the Windows operating system.

The Exchange Server Analyze then reads the following registry entry to determine the setting for the SystemPages registry value:

HKEY_LOCAL_MACHINE \System\CurrentControlSet\Control\Session Manager\Memory Management\SystemPages

If the Exchange Server Analyzer finds the value for SystemPages is set to something other than 0 and the server is running a 64-bit version of the Windows operating system, the Exchange Server Analyzer displays a warning.

This warning means that the SystemPages registry entry is incorrectly set for the version of the Windows operating system that is running on the server.

It is a recommended best practice that the SystemPages registry entry is set to the default value of 0 when running Exchange Server on the 64-bit version of the Windows operating system.

On a computer running the 64-bit version of the Windows operating system, you should never set the SystemPages registry value to anything other than 0. Changing it from 0 prevents the system from calculating an optimal value for your system and adjusting the value when your system changes.

importantImportant:
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\Control\Session Manager\Memory Management

  3. In the right pane, double-click SystemPages.

  4. In the Value data field, type 0, and then click OK.

  5. Exit the registry editor and restart the computer for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Windows Registry information for advanced users" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).

 
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