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:
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:
- Live Migration?
- Live Storage Migration?
- Shared Nothing Live Migration?
As a quick reminder, here are the different types of Live Migration and a brief description…
- Live Migration. In this scenario, the virtual machine running state is moved between compute nodes while the virtual machine storage stays in place.
- 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.
- 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.