2V0-621 Question #67: Real Exam Question with Answer & Explanation

The correct answer is A: Direct access to the storage array device. Physical Mode RDM is required for scenarios that need raw SCSI command passthrough, specifically direct storage array access and guest OS-level clustering spanning multiple ESXi hosts.

Question

Which two solutions require Physical Mode Raw Device Mapping (RDM)? (Choose two.)

Options

ADirect access to the storage array device
BVirtual Machine Snapshots
CHardware Acceleration
DGuest Clustering across ESXi hosts

Explanation

Physical Mode RDM is required for scenarios that need raw SCSI command passthrough, specifically direct storage array access and guest OS-level clustering spanning multiple ESXi hosts.

Common mistakes.

B. Virtual Machine Snapshots are incompatible with Physical Mode RDM - snapshots require a Virtual Mode RDM or VMDK because Physical Mode RDM does not support the delta disk mechanism needed for snapshot creation.
C. Hardware Acceleration (VAAI) does not require Physical Mode RDM - VAAI offloads operations to the storage array and functions with standard VMDKs and Virtual Mode RDMs.

Concept tested. Physical Mode RDM use cases and compatibility requirements

Reference. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-9E2A1C7C-0B3A-4D2A-8B27-B36A8F77A3C4.html

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