A customer needs a datastore to be seen across multiple vSphere clusters with applications inside of the virtual machines that must detect the physical characteristics of the storage device. Which…

A virtual disk on a VMFS datastore abstracts the underlying storage entirely, so guest applications see only a virtual disk with no visibility into the physical storage device's characteristics.

Virtual compatibility mode RDM still intercepts and translates SCSI commands, preventing the guest from seeing the physical device characteristics; it behaves similarly to a virtual disk from the guest's perspective.

A raw device mapping in physical compatibility mode allows the virtual machine to issue SCSI commands directly to the underlying physical LUN, exposing device attributes such as SCSI inquiry data, vendor strings, and physical geometry. This enables applications inside the VM (such as SAN management agents or clustering software) to detect the true physical characteristics of the storage device, which is not possible with virtual disk abstraction.

A virtual disk on an NFS datastore is a file-backed virtual disk that presents no physical storage characteristics to the guest and is protocol-abstracted at the hypervisor layer.