2008 R2 Hyper-V Host Upgrade to 2012 R2

I have a 2008 R2 Hyper-V host running two VMs. One is a 2008 R2 guest and the other is a 2012 R2 guest. I'm getting some networking errors in the system logs on the 2012 R2 guest. It would appear I should be running my host on 2012 R2.

My question is what is the best way to get there? Do I do an in place upgrade of my host from 2008 R2 to 2012 R2? Or do I do a clean reload of the host OS to 2012 R2? If the latter, how do I handle my virtual servers? Do I need to export them first, then import them into the new host?

I look forward to your replies.
mthsupportNetwork EngineerAsked:
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Philip ElderConnect With a Mentor Technical Architect - HA/Compute/StorageCommented:
No, one does not need to run the export/import process. The Hyper-V Import wizard will ask for a folder with the VM(s) in it and run the process.

Import has been significantly improved in 2012 RTM/R2.

As always, have a good backup of the guests before making significant changes!
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
I would recommend a clean installation of Windows 2012 R2.

and then look at my EE Article

HOW TO: Migrate a Windows Server 2008 R2 Hyper-V Virtual Machine (VM) to a Windows Server 2012 Hyper-V host server
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Philip ElderConnect With a Mentor Technical Architect - HA/Compute/StorageCommented:
Is the OS installed on a separate partition from the configuration and VHD files?

If yes, flatten, install fresh, drivers, configure networking and storage, and finally use the Import wizard in Hyper-V 2012 to get the VMs in.

Integration Services would need to be upgraded on the 08 R2 guest.
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mthsupportNetwork EngineerAuthor Commented:
Thanks Andrew. Your article seems to cover migrating from one server to another. This would be more of a swing to the same hardware. Does that change the process much?

Phil, yes the OS in on a separate partition from the VMs. Wouldn't I need to first Export to be able to import the VMs into 2012?
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Just Export the VMs to a USB External Disk, or Network Share, and then RE-Import from there.
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mthsupportNetwork EngineerAuthor Commented:
Thanks guys. After discussing your feedback with the client, we will spin-up a new 2008R2 VM and migrate the one application that is running on the 2012 R2 VM. This is the least disruptive method for the client.

I split points for those that replied.
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