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2V0-622 · Question #57

An administrator is configuring virtual machines to use Worldwide Port Names (WWPNs) to access the storage Which two conditions are required? (Choose two.)

The correct answer is A. The switches in the fabric must be N-Port ID Virtualization aware. B. The virtual machines must be using passthrough Raw Disk Mapping (RDMp). For VMs to use their own WWPNs (via NPIV) to access Fibre Channel storage, the fabric switches must support NPIV and the VMs must use physical-mode RDM disks.

Section 3 – Configure and Administer vSphere 6.5 Storage

Question

An administrator is configuring virtual machines to use Worldwide Port Names (WWPNs) to access the storage Which two conditions are required? (Choose two.)

Options

  • AThe switches in the fabric must be N-Port ID Virtualization aware.
  • BThe virtual machines must be using passthrough Raw Disk Mapping (RDMp).
  • CThe virtual machines must be using Virtual Machine Disk (VMDK).
  • DThe switches in the fabric must be Storage I/O Control aware.

How the community answered

(29 responses)
  • A
    72% (21)
  • C
    10% (3)
  • D
    17% (5)

Why each option

For VMs to use their own WWPNs (via NPIV) to access Fibre Channel storage, the fabric switches must support NPIV and the VMs must use physical-mode RDM disks.

AThe switches in the fabric must be N-Port ID Virtualization aware.Correct

N-Port ID Virtualization (NPIV) allows a single physical HBA port to present multiple virtual N_Port IDs, each with its own WWPN. The fabric switches must be NPIV-aware to recognize and route traffic for these virtual ports.

BThe virtual machines must be using passthrough Raw Disk Mapping (RDMp).Correct

Physical-mode Raw Disk Mapping (RDMp) passes the LUN directly to the VM, giving it the low-level SCSI access needed for the VM to present its own WWPN identity to the storage fabric. Standard VMDKs and virtual-mode RDMs do not provide this direct path.

CThe virtual machines must be using Virtual Machine Disk (VMDK).

VMDKs are abstracted virtual disks managed by the hypervisor and do not support direct WWPN-based storage access, making them incompatible with NPIV.

DThe switches in the fabric must be Storage I/O Control aware.

Storage I/O Control (SIOC) is a feature that manages I/O queue priorities among VMs sharing a datastore, and has no involvement in WWPN assignment or Fibre Channel fabric configuration.

Concept tested: NPIV WWPN assignment for VM storage access

Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.storage.doc/GUID-3F12B8FB-C9F2-4E8B-AB20-AB2A4FF40C58.html

Topics

#WWPN#N-Port ID Virtualization#passthrough RDM#Fibre Channel VM access

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