Hyper-V over SMB support in System Center Virtual Machine Manager 2012
In Windows Server 2012, Hyper-V added the capability to store virtual machine (VM) resources on network shares hosted on NAS devices as an alternative to SAN remote storage.
The Hyper-V storage stack in Windows Server 2012 now supports increased resiliency for network disconnects for these VM resources by using the “resilient handles” feature in the SMB protocol.
This basically means that now virtual machine resources such as VM configuration file, ISO files, VHD files and VHD snapshot files can be stored on any remote SMB file share that supports the SMB 2.2+ protocol.
See the full post at https://blogs.technet.com/b/scvmm/archive/2012/09/27/get-inside-the-hood-and-learn-details-of-hyper-v-over-smb-support-in-vmm-2012.aspx.