Recently, I was attempting to migrate a critical Hyper-V virtual machine using System Center Virtual Machine Manager onto a brand new storage array.  The storage migrations would fail each time I tried, bringing the server's services down for a short period of time.  After much research, and some help from MS Support, I was able to find an alternative way of migrating this VMs storage without using the storage migration functionality in VMM.

Before listing the steps I used, I recommend trying this in a lab environment before using it on your production servers.

1. Shutdown/Power-off the virtual server.
2. Make sure that the virtual memory of the server is set to "Static" in the machine's hardware settings.
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3. Open Hyper-V manager on the server hosting the VM, right-click the server, and select "Export".
4. Specify the location to which you would like to migrate the virtual machine. (Note: the export process make take some time depending on the size of the VM.)
6. Once the export process has completed, open the destination folder and verify that the virtual machine files and folders have been moved. (Note: It may be a good idea to back this up to a third location if not already.)
7. Now, go back to Hyper-V Manager, right-click the VM, and select "Delete".
8. Once the machine has been deleted, select "Import Virtual Machine" in the "Actions" section of the Hyper-V Manager console.

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9. Specify (or Browse to) the path in which the VM was exported.
10. You should now be able to power-on the server on the destination storage.

Again, before performing these steps-TEST, TEST, TEST!

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