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Yes. If you are trying to Migrate from Windows Server 2008 to Windows Server 2012 Hyper-V, the VM needs to be down.<br />
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However, If you are on Windows server 2012, you dont have to shutdown the VM to migrate to Windows Server 2012 R2 HyperV or a different Windows Server 2012 HyperV cluster. This is possible by using shared nothing live migration.<br />
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For Windows 2008 to Windows Server 2012 HyperV migration, you can refer this technet blog post.<br />
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<a href="http://blogs.technet.com/b/keithmayer/archive/2012/09/13/migrating-to-microsoft-hyper-v-server-2012-from-2008-r2-and-vmware-winserv-hyperv-itpro-vmware.aspx#.Uu5EF_mSw_4" rel="ugc">http://blogs.technet.com/b/keithmayer/archive/2012/09/13/migrating-to-microsoft-hyper-v-server-2012-from-2008-r2-and-vmware-winserv-hyperv-itpro-vmware.aspx#.Uu5EF_mSw_4</a><br />
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I dont even call it as a migration ;) - its just exporting the VM from source and importing the VM from destination.<br />
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Good luck !<br />
<br />
Shaba
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Yes. If you are trying to Migrate from Windows Server 2008 to Windows Server 2012 Hyper-V, the VM needs to be down.

However, If you are on Windows server 2012, you dont have to shutdown the VM to migrate to Windows Server 2012 R2 HyperV or a different Windows Server 2012 HyperV cluster. This is possible by using shared nothing live migration.

For Windows 2008 to Windows Server 2012 HyperV migration, you can refer this technet blog post.

http://blogs.technet.com/b/keithmayer/archive/2012/09/13/migrating-to-microsoft-hyper-v-server-2012-from-2008-r2-and-vmware-winserv-hyperv-itpro-vmware.aspx#.Uu5EF_mSw_4 [http://blogs.technet.com/b/keithmayer/archive/2012/09/13/migrating-to-microsoft-hyper-v-server-2012-from-2008-r2-and-vmware-winserv-hyperv-itpro-vmware.aspx#.Uu5EF_mSw_4]

I dont even call it as a migration ;) - its just exporting the VM from source and importing the VM from destination.

Good luck !

Shaba

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If migrating from say 2008 to 2012 (2008 also has virtual machines setup in hyperv manager) do the virtual machines need to be turned off prior to the migration ?
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If migrating from say 2008 to 2012 (2008 also has virtual machines setup in hyperv manager) do the virtual machines need to be turned off prior to the migration ?

Migration HyperV

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.