An administrator is asked to take a snapshot of a virtual machine prior to an application upgrade. The virtual machine has one standard virtual machine disk
(VMDK) and one physical mode raw device mapping (RDM) attached.
Which statement is true with regard to taking this snapshot?
The administrator will be unable to snapshot the RDM. VMware does not support snapshots of physical mode raw device mappings (RDMs), although it supports snapshots of virtual mode RDMs and standard virtual machine disks (VMDKs). Therefore, any attempt to snapshot the physical mode RDM will fail, confirming that the correct answer is that the administrator will be unable to snapshot the RDM.
IT happend to me in a project
RDM will not be taken in a snapshot as it is physical, however if it was virtual it will be available for snapshot https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-0114693D-94BF-4D0E-9BA4-416D4A51A5A1.html
VMware does not support snapshots of raw disks, RDM physical mode disks, or guest operating systems that use an iSCSI initiator in the guest. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.hostclient.doc/GUID-53F65726-A23B-4CF0-A7D5-48E584B88613.html
A. The administrator will be unable to snapshot the RDM. VMware does not support snapshots of raw disks, RDM physical mode disks, or guest operating systems that use an iSCSI initiator in the guest. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vm_admin.doc/GUID-53F65726-A23B-4CF0-A7D5-48E584B88613.html?hWord=N4IghgNiBcIC5gNYFMAEZUGcB2YAOmAFgPZyoBKAIgLIgC+QA