You can specify a new size for a Writable Volume by using the App Volumes Manager and App Volumes increases the .vmdk file to the new size.

Important: You cannot expand a Writable Volume if your Machine Manager is configured as VHD In-Guest Services. This feature is available only on vCenter Server. See Types of Hypervisor Connections and Machine Manager Configurations and Configure and Register the Machine Manager.

Disk Size (Total) indicates the total disk space allocated for the Writable Volume. Disk Size (Free) indicates the remaining disk space if the Writable Volume already has some data.


  1. From the App Volumes Manager console, select INVENTORY > Writables.
  2. Click the + sign next to the entity whose Writable Volume you want to expand.
    Along with other Writable Volume information, Disk Size is displayed.
  3. Click Expand.
    A Confirm Expand window is displayed.
  4. On the Confirm Expand window, enter the new size for the volume and click Expand.
    You must enter a size that is at least 1 GB greater than the current size of the Writable Volume.


The Writable Volume file is expanded to the new size the next time the entity logs in to the virtual machine.