Problem with Huge .AVHD Snapshot, best way to merge and limit downtime.

We have a production Web Server (VM) under windows 2008 R2. We just realise that we have a 450Go .AVHD and 400Go VHD file.
We need to merge the .VHD/.AVHD, but from what i know, this will be a VERY LONG Downtime.
We also have a Windows 2012 Host available. Should I copy (.VHD/.AVHD) files to the new host (2012), create a new VM and attache the (.VHD/.AVHD). Then i will be able to use Server 2012 Live Merge (without downtime) ?
What would be the best solution ?
Regards,
Simon

The Live Merge will only work if you Export the VM and then Import it OR copy the VM disks, plus configuration to the Hyper-V 2012 Server and Import it.
The background / Live merge will only happen if Hyper-V knows this is a snapshot.  So copying that part of the configuration over is key.
Simply copying the two virtual disks over will not achieve the same results.
In this case your time is sunk into the process of Exporting / getting the VM from Server A to Server B.  If you can make that efficient, then you have it.
And, you can always test this ahead of time.  So you know what you are getting yourself in to.
Also, I seem to recall that 2008 R2 was he release that added the option to export a snapshot.  If so, this is another option.  Create a new snapshot, right click it, select export (again, your VM must be powered off for this with 2008 R2).
The result is one flat VHD and no snapshots to merge.  Just import and power on.
You can test if that option is there today with some empty VM.
Brian Ehlert
http://ITProctology.blogspot.com
Learn. Apply. Repeat.
Disclaimer: Attempting change is of your own free will.

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