Note: This article is based on Hyper-V 2.0, and might not apply to Hyper-V 3.0 (Server 2012)

The Hyper-V(tm) VM State to Memory Dump Converter (vm2dmp) is a command-line tool that converts the saved state of a Hyper-V virtual machine to a full memory dump file compatible with Debugging Tools for Windows. You can use this tool to convert the memory contents of a virtual machine at a point of time to a full memory dump file. The vm2dmp tool makes it easier to debug hard problems when they occur on virtual machines. Using this tool, developers can save time by avoiding the need to create a dump file over a slow debugger connection or from the operating system running inside the virtual machine.

For all the details and to download the tool see