Company set up a set of virtual environment, all of the virtual machine recreated by hand, then install the operating system and reinstall the application and data derived from source physical unit, and then to restore to a virtual machine,

There is a problem now is that assumption on November 6, 1 application servers data migration to the virtual machine; But production systems do not immediately switch to the virtual machine, the company decided to officially launch in November 9, new virtual machine to do production system;

That is, on November 6 to 9 November 3 days this data, how to migrate to the new virtual machine

You have what good method???