One piece that may not be all that clear for VMware users is that Storage VMotion (now available as a feature within our GUI and not just in the command line with vSphere 4.0) allows for an easy transition from previously thick provisioned virtual disks to new thin provisioning virtual disks. So, any user that upgrades to vSphere can now use this function to save up to 50% in terms of storage allocated in a virtual disk. Another product of this technology is the move to a thin provisioned virtual disk will also defrag the disk.
