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2V0-621 · 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) blocks features that require capturing or migrating VM state, but CPU and memory topology features like vSMP and vNUMA remain fully available.

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

(26 responses)
  • A
    4% (1)
  • B
    15% (4)
  • C
    81% (21)

Why each option

DirectPath I/O (PCI passthrough) blocks features that require capturing or migrating VM state, but CPU and memory topology features like vSMP and vNUMA remain fully available.

AFault Tolerance

Fault Tolerance is not available with DirectPath I/O because FT requires continuous memory state replication between primary and secondary VMs, which is incompatible with a directly attached PCI device whose state cannot be captured by the hypervisor.

BSuspend and Resume

Suspend and Resume is not supported with DirectPath I/O because saving a suspended VM requires serializing the complete device state, and the hypervisor cannot access or capture the internal state of a directly passed-through PCI device.

CVirtual Symmetric Multi-Processing (vSMP)Correct

Virtual SMP allows multiple vCPUs to be assigned to a VM and remains supported with DirectPath I/O because it is a CPU scheduling abstraction handled entirely by the hypervisor, independent of PCI device state.

DVirtual Non-Uniform Memory Access (vNUMA)Correct

vNUMA exposes physical NUMA topology to the guest OS and is supported with DirectPath I/O because it is a memory architecture configuration feature that does not require the hypervisor to capture or transfer the state of the passed-through device.

Concept tested: DirectPath I/O feature compatibility and limitations

Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.networking.doc/GUID-1F91E05D-ECA1-4B59-A4EC-1E2EA0726944.html

Topics

#DirectPath I/O#vSMP#vNUMA#VM features

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