ReFS Volumes Exported to Hyper-V Mounting as RAW (4377322)

ReFS volumes are mounted in raw format during the execution of a Virtual Standby for a Hyper-V virtual machine with Windows Server 2016 when the Hyper-V target operating system version is higher than that of the original virtual machine.

The Event Viewer displays the following error:

ReFS failed to mount volume. Version 3.4 doesn't match expected value 3.1

This issue has been identified and is being tracked as Defect RR-111560.

This issue cannot be resolved through code changes because it is inherent to how ReFS functions; it uses the ReFS version of the Hyper-V target to mount the volumes.

The following workarounds are available:

1. Perform a file-level restore of the volume in RAW format.
2. Use a Hyper-V target that matches the operating system version of the virtual machine.
3. Upgrade the virtual machine's operating system to a Windows version that is the same as or newer than the target Hyper-V server.