How Does VMware VMotion Work?
Live migration of a virtual machine from one physical server to another with VMware VMotion is enabled by three underlying technologies.
First, the entire state of a virtual machine is encapsulated by a set of files stored on shared storage such as Fibre Channel or iSCSI Storage Area Network (SAN) or Network Attached Storage (NAS). VMware vStorage VMFS allows multiple installations of VMware ESX® to access the same virtual machine files concurrently.
Second, the active memory and precise execution state of the virtual machine is rapidly transferred over a high speed network, allowing the virtual machine to instantaneously switch from running on the source ESX host to the destination ESX host. VMotion keeps the transfer period imperceptible to users by keeping track of on-going memory transactions in a bitmap.
Once the entire memory and system state has been copied over to the target ESX host, VMotion suspends the source virtual machine, copies the bitmap to the target ESX host, and resumes the virtual machine on the target ESX host. This entire process
VMotion occur in memory level (bitmap) and, and not in Storage Levl, you cannot see in datastore file of vmotion because do not exist. you can see traffic how mentioned above
also read http://www.yellow-bricks.com/2011/04/13/vmotion-and-quick-resume/
http://www.vmware.com/files/pdf/VMware-VMotion-DS-EN.pdf
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