Upgrading Windows 2008 R2 with Hyper-V machines to Windows 2012 R2

I have a Windows 2008 R2 server that is running several Hyper-V virtual machine ranging from 2003 to 2008 R2. We'd like to upgrade this server to 2012 R2. Is this just a matter of putting the upgrade CD in and running an in place upgrade? Are we going to encounter any problems with the guest virtual machines if we do this?
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OAC TechnologyProfessional NerdsAsked:
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Robin CMSenior Security and Infrastructure EngineerCommented:
The host needs to reboot as part of the upgrade, and this will obviously cause the VMs to stop.
You'd be better off migrating the VMs onto another host, upgrading the original host and the moving the VMs back again.

If you only have the one host, you need to shut all the VMs down first. http://social.technet.microsoft.com/wiki/contents/articles/16289.single-hyper-v-server-running-windows-server-2008-r2-with-gui-in-place-upgrade-to-windows-server-2012-with-gui.aspx
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
If the host has two partitions, one for the OS and one for the guests and their configuration files, then you can either load from DVD or a bootable flash drive with the installer files/folders copied onto it.

NOTE: If the hardware is older than three to four years then weigh this decision carefully.
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OAC TechnologyProfessional NerdsAuthor Commented:
Yes, the virtual machine files are on a separate partition from the OS. The hardware is about 1.5 years old, so we're good there.

So once I upgrade I should be able to import the existing Hyper-V machines without any problems, correct?
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Robin CMSenior Security and Infrastructure EngineerCommented:
Ha, good thing I checked, was ages since I ran 2008 R2! Coming from 2008 R2 you have to convert the VMs into 2012 format first, and then import those into 2012 R2. You need a 2012 Hyper-V server, and just import the 2008 R2 VMs then export again.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Run the import wizard in the newly configured Hyper-V and you should be good to go. No conversion or changes required.

You may need to reseat NIC settings but we've not needed to do so unless importing just the VHD/VHDX files to a new VM.
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OAC TechnologyProfessional NerdsAuthor Commented:
Perfect. I'll be doing this conversion on Friday so I'll let you know how it goes. The plan is to shut down the VM's on the 2008 R2 server, put the 2012 R2 standard CD in and perform the OS upgrade, and then if the virtual machines don't show up in the new Hyper-V, use the import function to import them into Hyper-V after the upgrade. Does that sound like everything should go well?

Thank you
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
It should.

As always, make sure you have a known good backup of everything before proceeding!
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