If you run out of disk space, you can increase the size of the disk. You can change the virtual device node and the persistence mode for virtual disk configuration for a virtual machine.


Power off the virtual machine.

Verify that you have the following privileges:
  • Virtual machine.Configuration.Modify device settings on the virtual machine.
  • Virtual machine.Configuration.Extend virtual disk on the virtual machine.
  • Datastore.Allocate space on the datastore.


  1. Right-click a virtual machine in the inventory and select Edit Settings.
  2. On the Virtual Hardware tab, expand Hard disk to view the disk options.
  3. (Optional) To change the size of the disk, type a new value in the Provisioned Size text box and select the units from the drop-down menu.
    Important: Extending the size of a virtual hard disk causes stun time for the virtual machine. The stun time is longer if the virtual disk is of the Eager Zeroed Thick type.
  4. (Optional) To change the way that disks are affected by snapshots, select a disk mode option.
    Option Description
    Dependent Dependent disks are included in snapshots.
    Independent - Persistent Disks in persistent mode behave like conventional disks on your physical computer. All data written to a disk in persistent mode are written permanently to the disk.
    Independent - Nonpersistent Changes to disks in nonpersistent mode are discarded when you turn off or reset the virtual machine. With nonpersistent mode, you can restart the virtual machine with a virtual disk in the same state every time. Changes to the disk are written to and read from a redo log file that is deleted when you turn off or reset the virtual machine.
  5. Click OK.