The Windows hibernation option creates a large system file that can increase the size of the linked-clone OS disks that are created from the parent virtual machine. Disabling the hibernation option reduces the size of linked-clones.
The Windows hibernation option creates a hidden system file, Hiberfil.sys. Windows uses this file to store a copy of system memory on the hard disk when the hybrid sleep setting is turned on. When you create a linked-clone pool, the file is created on each linked clone's OS disk.
On Windows 7 or Windows 8 virtual machines, this file can be 10GB.
Familiarize yourself with the Windows hibernation feature. See the Microsoft Support Web site. For information about disabling hibernation on Windows 8 or Windows 7, see the Microsoft Support Web site and search for how to disable and re-enable hibernation on a computer that is running Windows.
- In vSphere Client, select the parent virtual machine and select Open Console.
- Log in to the Windows guest operating system as an administrator.
- Disable the hibernation option.
- Click Start and type cmd in the Start Search box.
- In the search results list, right-click Command Prompt and click Run as Administrator.
- At the User Account Control prompt, click Continue.
- At the command prompt, type powercfg.exe /hibernate off and press Enter.
- Type exit and press Enter.
- Log out of the guest operating system.
When you a create linked-clone machines from the parent virtual machine, the Hiberfil.sys file is not created on the linked-clone OS disks.