bigip_vcmp_guest module does not delete the virtual disk on guest deletion

Unfortunately, according to the vCMP manual they leave the disk for reuse by another guest later.

This is from the article I link to below:

Deleting a virtual disk from the BIG-IP system Using the BIG-IP Configuration utility, you can delete a virtual disk from the system. You do this by using the Virtual Disk List screen.

Important: This is the only way to delete a virtual disk from the system. If you delete the associated guest instead, the system retains the virtual disk for re-use by another guest later.

On the Main tab, click vCMP > Virtual Disk List. Locate the Virtual Disk List area of the screen. In the Name column, locate the name of the virtual disk that you want to delete. To the left of the virtual disk name, select the check box. Click Delete. The system prompts you to confirm the delete action. Click Delete.

HERE is some more info on that.

Hope that helps, if it does please up-vote and select this answer, it would be greatly appreciated!

-Dylan