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Upgrade 2008r2 to 2012r2 with hyper V role installed?

Posted on 2016-11-08
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Last Modified: 2016-11-29
Title says it all - need to upgrade from an 08r2 server with hyper V to a 2012r2 server with hyper V.  I have another 2012 r2 hyperV server across a WAN if that is helpful.  From what ive read the OS is an option for an upgrade but not the hyperV?  I do know I cant run a 2012r2 hyper V vhd on an 08r2 hyper V box - that is why im upgrading this one so we have 2 that are the same and can back eachother up.
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Question by:rhwimmers
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by:LesterClayton
ID: 41880087
Hyper-V is part of the OS - you'll upgrading the Hyper-V from version 2 to version 3 as part of the OS upgrade. All VM's which run on version 2 will run on version 3 without a problem, but you won't be able to go backwards after the upgrade.

Once you have completed the uprade, remember to install the latest Integration agent using Hyper-V Manager.
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by:rhwimmers
ID: 41882732
Ok so I can put a 2012r2 disk in the 2008r2 server, do an upgrade, and the OS will upgrade to 2012r2 and hyperv will now be the newest version, and will open the former 2008r2 VMs?
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LesterClayton earned 500 total points (awarded by participants)
ID: 41882738
I stand corrected - upgrading is not possible if you have the Hyper-V role installed.  You would need to remove the Hyper-V role, and then do an upgrade - and then install Hyper-V on the upgraded machine, and then import all the VM's.

There's a very useful blog about it on Technet.  Check out http://social.technet.microsoft.com/wiki/contents/articles/19768.hyper-v-upgrade-hyper-v-server-2008-r2-to-hyper-v-server-2012-r2.aspx

Sorry for misleading you before - my bad.
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by:rhwimmers
ID: 41882755
Ah yeah that is the article I read that prompted my question.  Trying to determine the best way to do this 08r2 to 12r2 upgrade so you think move the VMs to an external drive, turn off hyper V, upgrade OS to 2012, then import the VMs into 2012?
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by:LesterClayton
LesterClayton earned 500 total points (awarded by participants)
ID: 41883392
Don't just move the VM's to an external drive - use the Export wizard - it will make the VM's importable again.  Sadly, I don't have 2008 R2 any more, so I can't do a print screen of the Export.  Just right click the VM and select "Export", and then specify the path.
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by:LesterClayton
ID: 41905445
Answers provided are technically correct based on the question asked
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