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Hyper-v Standby Server

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Last Modified: 2015-03-09
I recently migrated a SBS2008 server to 2012 R2 as a Hyper-V VM.  The migration went fine and all is well with the new server.

I've already migrated FSMO roles, uninstalled Exchange (they don't use Exchange) and demoted the server.

I now want to install 2012 R2 Hyper-V server on the old box to serve as a temporary host in the event of hardware failure on the current physical server.  My question is as follows:  The new server has 1 TB of storage provisioned as a virtual hard disk for the VM.  The server is only using 200 GB of that right now.  The old server only has 500 GB of space total.  Will I be able to bring the VM up on the older server with less disk space as long as total in use on new server doesn't exceed the 400 or so GB I can allocate on the old server?

Thanks in advance.
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