Hyperv 2008 R2 Snap shot

I have 3 node Hyperv 2008 R2 cluster and 15 VMs loaded in it. One of the VM is having a snapshot that is taken two years back and now I need clear this snaphot instance without lossing data. Can any one suggest the best way to do this.

Remove the snapshot using hyperv manager, it will merge the next time the
VM is shut down, pretty simple.
here's the problem, if that snapshot is very old and very large you will need a bunch of time and bunch of disk space. so before you delete and shutdown go to location where the VHD is stored you will see a VHD and a AVHD file assume the VHD will grow by
the size of the avhd so if you don't have enough disk space free for the merge you'll have to get some before trying the merge.

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