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2008 R2 Hyper-V Host Upgrade to 2012 R2

Posted on 2014-12-10
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Last Modified: 2014-12-19
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.
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Question by:mthsupport
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 250 total points
ID: 40492586
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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by:Philip Elder
Philip Elder earned 250 total points
ID: 40492587
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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by:mthsupport
ID: 40493636
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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Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 119

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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 250 total points
ID: 40493697
Just Export the VMs to a USB External Disk, or Network Share, and then RE-Import from there.
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Philip Elder earned 250 total points
ID: 40493818
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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by:mthsupport
ID: 40509304
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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