As you may know that there is no ability to use storage Vmotion to migrate VMs from datastore to a new one in old VMware versions but now you can.
Use this plugin , install it, enable it and you will find a new option in VM right click list to do storage migration.
Trick: you will use Drag and drop method to move the harddisks from old datastore to new datastore. and Apply.
Download it here. from our 4Shared http://www.4shared.com/get/vPlbh1wu/...-bin-1000.html
Use password: egyptengineers