vSphere Storage vMotion (Storage vMotion) enables live migration for running virtual machine disk files from one storage location to another with no downtime or service disruption. With vSphere 5.0, multiple enhancements have been introduced to increase efficiency of the Storage vMotion process, to improve overall performance, and for enhanced supportability. Storage vMotion in vSphere 5.0 now also supports the migration of virtual machines with a vSphere snapshot and the migration of linked clones.
The enhancements to Storage vMotion include a new and more efficient migration process through the use of a new feature called Mirror Mode. Mirror Mode enables a single-pass block copy of the source disk to the destination disk by mirroring I/Os of copied blocks. Not only has the efficiency of Storage vMotion increased, but also the migration time predictability, making it easier to plan migrations and reducing the elapsed time per migration.
The mirror driver is enabled on a per–virtual machine basis and resides within the VMkernel. When the guest OS of the virtual machine that is undergoing the process using Storage vMotion initiates a write to an already copied block, the mirror driver will synchronously mirror this write and wait for both acknowledgements before communicating this to the guest OS.
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