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2V0-622 · Question #39

Which two features are available for virtual machines configured with DirectPath I/O? (Choose two.)

The correct answer is C. Virtual Symmetric Multi-Processing (vSMP) D. Virtual Non-Uniform Memory Access (vNUMA). DirectPath I/O (PCI passthrough) disables features that require capturing device state, but vSMP and vNUMA remain fully supported because they are CPU and memory topology features independent of the passthrough device.

Section 8 – Deploy and Administer VMware Virtual Machines

Question

Which two features are available for virtual machines configured with DirectPath I/O? (Choose two.)

Options

  • AFault Tolerance
  • BSuspend and Resume
  • CVirtual Symmetric Multi-Processing (vSMP)
  • DVirtual Non-Uniform Memory Access (vNUMA)

How the community answered

(35 responses)
  • A
    3% (1)
  • B
    9% (3)
  • C
    89% (31)

Why each option

DirectPath I/O (PCI passthrough) disables features that require capturing device state, but vSMP and vNUMA remain fully supported because they are CPU and memory topology features independent of the passthrough device.

AFault Tolerance

Fault Tolerance requires vLockstep, which continuously mirrors CPU and memory state between primary and secondary VMs; this mechanism cannot capture or replay the internal state of a physically passed-through PCI device, making FT incompatible with DirectPath I/O.

BSuspend and Resume

Suspend and Resume requires serializing the complete VM state to disk, including all device state; because a passthrough device's hardware state cannot be saved by the hypervisor, Suspend and Resume is not supported when DirectPath I/O is enabled.

CVirtual Symmetric Multi-Processing (vSMP)Correct

Virtual SMP (vSMP) assigns multiple vCPUs to a VM and is a hypervisor scheduling feature that operates independently of any PCI passthrough device, so it remains available with DirectPath I/O.

DVirtual Non-Uniform Memory Access (vNUMA)Correct

Virtual NUMA (vNUMA) exposes the host NUMA topology to the guest OS to optimize memory locality; it is a memory topology presentation feature with no dependency on the state of a passthrough PCI device, so it is compatible with DirectPath I/O.

Concept tested: DirectPath I/O feature compatibility and restrictions

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-A5F9DA88-E8CC-43B2-AC5E-D8C0C1E5FC21.html

Topics

#DirectPath I/O#hardware passthrough#vSMP#vNUMA

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