upgrade windows server 2012 hyper-v cluster to windows server 2012 r2 without downtime?

Hello Experts,

 we have 2 hyper-v clusters.

The first cluster consists of 3 Microsoft windows 2012 servers , and the second one consists of 2 Microsoft windows 2012 r2.


We want to upgrade the first cluster servers to windows 2012 R2 and join them to the second cluster.

The goal is to have one unique cluster with Microsoft windows 2012 R2 without any downtime or risk.

Is it possible to do a live upgrade?? If yes how?
cismoneyAsked:
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Casey WeaverConnect With a Mentor Network EngineerCommented:
You're looking at doing a role copy from the old cluster to the new cluster. There is no way, that I know of, to do this without downtime because you set up two different farms. Even if they share the same visible storage, the two clusters will be different. There isn't any risk, but there *will* be downtime. You can see an exercise in it here: http://workinghardinit.wordpress.com/2013/07/08/migrating-a-hyper-v-cluster-to-windows-2012-r2/ 

You can of course in place upgrade your 2012 hyperv hosts to 2012 R2. But that won't get you the one unique cluster you're after. You need to merge storage and clusters and that will require downtime.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
This will require downtime to complete.
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Cliff GaliherCommented:
Actually, 2012 supports live migration outside of the cluster *and* moving from 2012 to 2012 R2 (but not back to 2012.) So you can use live migration to move from 2012 to 2012 R2 with no VM downtime.
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Cliff GaliherCommented:
2012 added storage migration as well. You can move from a 2012 cluster to a 2012 R2 cluster with *zero* downtime as long as both clusters can communicate to process the live migration. It is a fully supported scenario and has been done in the field many times.
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cismoneyAuthor Commented:
@cliff galiher please do you have a step by step guide?
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Cliff GaliherCommented:
As always, TechNet is usually a good first stop for guidance:

http://technet.microsoft.com/en-us/library/dn486799.aspx
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