Disabling the prefetch and superfetch features avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a View Composer linked clone's virtual disk.
To disable the prefetch and superfetch features, you must edit a Windows registry key and disable the Prefetch service on the virtual machine.
The following steps apply to Windows 7 and Windows 8. The steps might vary on different Windows operating systems.
See the Microsoft TechNet Web site for information on how to use the Windows Registry Editor.
- Start the Windows Registry Editor on the local Windows virtual machine.
- Navigate to the registry key called PrefetchParameters.
The registry key is located in the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters.
- Set the EnablePrefetcher and EnableSuperfetch values to 0.
- Click .
- Select Services and click Open.
- Double-click the Superfetch service.
- In the Superfetch Properties (Local Computer) dialog, click Stop.
- In the Startup type menu, select Disabled.
- Click OK.