Merging a Hyper-V child VHD/VHDX differencing disks with the parent VHD/VHDX.

I’ve recently had a requirement to merge some child differencing disks, with the associated VHD/VHDX in Hyper-V.

Thankfully this is very straight forward and can be done one of two ways(after a confirmed backup and/or export of your VM!):
1.) Using the edit disk option in Hyper-V:
2.) Using DiskPart from a command prompt.
Enter Diskpart.
select vidsk file=”C:\Temp\MT12-SC-H2-LON-AP1\Virtual Hard Disks\MT12-SC-H2-LON-AP1.vhd
merge vdisk depth=1
Remember in either option, you will need to go back into your VHD location in the Hyper-V VM settings and change the path to point to the base disk.
Note: If you go with Option 2, you will need to manually remove the child differencing disk from your VHD storage location.

About AJ McKean

Based in sunny Tauranga, New Zealand, AJ McKean is a Senior Systems Engineer in Mt Maunganui. With over 15 years of professional IT experience working in both New Zealand and the United States, he holds several certifications including MCSE(2000-2003), MCITP:Enterprise(2008), MCSA(2012), VMware VCP-DCV5.5, CompTIA A+ & is an HP Storage Architect. He is passionate about all things IT, especially virtualization, automation & cloud technologies.

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