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Hyper-V VM Migrations that uses Multiple .VHD fi

Posted on 2014-02-14
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Last Modified: 2014-11-12
Hi,
I am preparing to move a Virtual Machine. This VM is configured with Hyper-V and uses a total of 3 separate .vhd files for its drive structure. I am moving this to a different host which has more resources for increasing performance.

I have moved Virtual Machines before but they all used a single .vhd file.

How should I prepare to migrate a more complex Virtual Machine with multiple .vhd files.

Thanks for your suggestions.
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Question by:carloc
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Expert Comment

by:Cliff Galiher
ID: 39860493
Nothing special. It still works the same way.
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Author Comment

by:carloc
ID: 39860540
Is the process to create a new VM with the existing vhd file for the System OS, then add the extra drives and add the drive letter mapping.
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Cliff Galiher earned 500 total points
ID: 39860755
That is not how VMs are normally moved, but that would technically work. Because it is a new VM, you will have HAL and network issues on first boot.

The more common method to move a VM is dependent on environment and connectivity. Export/import is the most flexible option insofar as you can export to a USB drive or whatever, and import from there. This preserves all of your VM settings including NIC MAC, etc so you avoid some hairy problems. The export process would export all attached VHD(x)s automatically so again, whether you have one or ten makes no difference.

Similarly live migration would do the same, as would shared-nothing live migrations. Storage management and attachment is all handled by the VMM service.

But even with a full manual move of VHDs and creating a new VM, the process is the same whether you have one virtual drive or ten. If you have one, you create a new VM and specifiy the VHD (and perhaps have to reset ACLs so the VMM service can attach the drive.) And if you have ten? Same thing. You still have to copy the VHDs and you still have to attach them and you still have to potentially reset ACLs. There is nothing "special" about the first VHD from a VM standpoint. From the guest standpoint it is obviously a bootable drive and has system data, but that is purely within the guest. The VMM doesn't care.
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Author Closing Comment

by:carloc
ID: 40018272
Thanks for your help. I was eventually able to complete the move. Great Advice.
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