Tag Archives: Shared VHDX

Windows Server Hyper-V 2012 R2 Shared VHDX Feature

With Windows Server Hyper-V 2012 R2 you can share a virtual disk between virtual machines.

This is very useful in Clustering scenarios  and you can read more about this technology here:

http://blogs.technet.com/b/storageserver/archive/2013/11/25/shared-vhdx-files-my-favorite-new-feature-in-windows-server-2012-r2.aspx

I’d like to share this additional information rised during a q&a with collegues from product group:

Question: Using shared VHDX feature which are the implications for Live Migration? With Shared VHDX can you perform:

  1. Live Migration?
  2. Live Storage Migration?
  3. Shared Nothing Live Migration?

As a quick reminder, here are the different types of Live Migration and a brief description…

  1. Live Migration. In this scenario, the virtual machine running state is moved between compute nodes while the virtual machine storage stays in place.
  2. Live Storage Migration. In this scenario, the virtual machine running state stays on the same compute node while the virtual machine storage is migrated to a new location.
  3. Shared Nothing Live Migration. In this scenario, the virtual machine running state and the virtual machine storage is moved.

Answer:  Shared VHDX works with Live Migration however it doesn’t work with Shared Nothing Live Migration and Live Storage Migration because moving a virtual machine with Shared VHDX requires systematically coordinating configuration updates for the associated virtual machines across multiple hosts.

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