Migrating Hyper-V 2008 R2 HA Clustered to Hyper-V 2012R HA Clustered with minimal downtime to new hardware and storage

Folks:
Alright, let's hear it.
I am tasked with migrating an existing Hyper-V HA Clustered environment from v2008R2 to new server hardware and storage running v2012R2.
Web research is not panning out, it seems that we are looking at a lot of downtime, I am a VMware guy and I would do likely a V2V migration at this point with minimal downtime.
What are my options in the Hyper-V world?  Help a brother out.

Merging does require some extra disk space, but not much. 
In most cases the data in the differencing disk is change, and not additional files.
The absolute worst case is that the amount of disk space necessary would be the total of the root plus the snapshot.
Quite honestly, I have seen merges succeed with folks being down to 10 GB free.
But, low disk free space will cause the merge to take longer. So you always want to free up storage space to speed up the process.
Merge is designed to not lose data.  And that is really what takes the time in the background.  To ensure that a partial merge will still allow a machine to run, and a full merge has everything.
Folks have problems when their free space hits that critical level of 10GB, and if they have some type of disk failure during the process.
It is always best to let the merge process happen and do its work.  You can't push it, and you cannot stop it once it starts (you can only cause it to pause).  That said, you can break it by trying to second guess or manipulate it.
Brian Ehlert
http://ITProctology.blogspot.com
Learn. Apply. Repeat.

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