troubleshooting Question

upgrading Hyper-V 2008 R2 cluster to 2012 cluster

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HornAlumFlag for United States of America asked on
Microsoft Virtual ServerWindows Server 2008Windows Server 2012Hyper-V
5 Comments1 Solution969 ViewsLast Modified:
Got a 2008 R2 Hyper-V cluster with two hosts and an iSCSI SAN

I understand that you can't do an in-place upgrade of an existing 2008 R2 cluster. I've spoken to some of the Microsoft engineers at Tech-Ed a few years ago about how to turn my 2008 R2 cluster into a 2012 cluster and i get the high level steps below:


Move all VM's to single host


Evict empty host from cluster


Rebuild server as a 2012 machine, with Hyper-V


Export all VM's, save them on the SAN


Connect 2012 machine to SAN


Import VM's onto 2012 box


Rebuild the other server


Connect other server to SAN


Create the cluster, along with CSV's and all that
my question basically is about the subtle steps that go into some of those high level steps (i may have missed a step or two as well in there, or some could be in the wrong order)

Do I need to break the cluster shared volumes on the original cluster at all for the first rebuilt host to speak to the SAN?

Do I delete any old original VM files from the 2008 Hyper-V version due to the export/import process?

Are there any tricks in order to have the 2008 R2 and 2012 Hyper-V servers talk to the iSCSI SAN at the same time? (so that both see the files), or do i need to Export EVERYTHING, then break communication to the SAN from the 2008 box, before i can communicate with the SAN on the 2012 box?

Just trying to make sure i have the subtle detailed steps in mind before I go about trying to upgrade the cluster. It's possible i may buy a 3rd host during the upgrade process, so that i could create a hyper-v 2012 cluster before i wipe and rebuild the other server into 2012 and then add that machine to the cluster. i just don't want to lose the VM's.

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