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.
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)- A4% (1)
- B15% (4)
- C81% (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.
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.
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.
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.
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
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