Nonadministrative users in the guest operating system are able to shrink virtual disks. Shrinking a virtual disk reclaims the disk's unused space. However, if you shrink a virtual disk repeatedly, the disk can become unavailable and cause a denial of service. To prevent this, disable the ability to shrink virtual disks.

Turn off the virtual machine.

Verify that you have root or administrator privileges on the virtual machine.

1

Find the virtual machine in the vSphere Web Client inventory.

a

Select a data center, folder, cluster, resource pool, or host.

b

Click the Related Objects tab and click Virtual Machines.

2

Right-click the virtual machine and click Edit Settings.

3

Select VM Options.

4

Click Advanced and click Edit Configuration.

5

Add or edit the following parameters.

Name

Value

isolation.tools.diskWiper.disable

TRUE

isolation.tools.diskShrink.disable

TRUE

6

Click OK.

When you disable this feature, you cannot shrink virtual machine disks when a datastore runs out of space.