how to use pyVmomi to track on VMs disk related events

Hi Guys,


       I need to have asynchronous notifications on the changes that take places to a VM's vmdk files. The scope of  changes are like disk resizing, disk deletion etc. I need to use pyVmomi for this and my code will run on the Esx 5.1 host. Can you please tell me if asynchronous notifications are possible or do i need to poll?


Can you please tell me how can this be achieved. I am new to it and learning.


 Thanks.