Allocate the same VHD between 2 VM's

Hi, i'm migrating a test enviroment from Oracle VirtualBox to Hyper-V 2012 and i'm facing a big challenge.

The test enviroment consists on two Linux VM's that run Oracle RAC. In the VirtualBox enviroment, i'm able to share a vhd disk between the VM's (both of them see the same disk, similiar as a storage), but as far as i know, Hyper-V doesn't have this kind of option.

I'm not in a situation to use a differencing disk, since the two VM's need to be able to see the same disk.

I hope that someone can help me with this.