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2V0-622D · Question #66

An administrator cannot enable multi-processor Fault Tolerance (SMP-FT) for a virtual machine. Which are two possible causes for this? (Choose two.)

The correct answer is C. The virtual machine has 6 vCPUs assigned. E. The virtual machine has snapshots present.. SMP-FT enforces a maximum vCPU count per protected VM and is incompatible with snapshots, either of which independently blocks enabling Fault Tolerance.

Section 6 – Administer vSphere 6.5 Availability

Question

An administrator cannot enable multi-processor Fault Tolerance (SMP-FT) for a virtual machine. Which are two possible causes for this? (Choose two.)

Options

  • AThe virtual machine is running on a vSAN datastore.
  • BThe Fault Tolerance network is using a 10Gbit uplink.
  • CThe virtual machine has 6 vCPUs assigned.
  • DThe virtual machine has a 1TB VMDK attached.
  • EThe virtual machine has snapshots present.

How the community answered

(31 responses)
  • B
    3% (1)
  • C
    94% (29)
  • D
    3% (1)

Why each option

SMP-FT enforces a maximum vCPU count per protected VM and is incompatible with snapshots, either of which independently blocks enabling Fault Tolerance.

AThe virtual machine is running on a vSAN datastore.

vSAN datastores are fully supported for Fault Tolerance in vSphere 6.5 and later; storing protected VM files on vSAN does not prevent enabling SMP-FT.

BThe Fault Tolerance network is using a 10Gbit uplink.

A 10Gbit uplink is the recommended minimum bandwidth requirement for the FT logging network with SMP-FT, meaning it satisfies rather than violates the prerequisite - it is not a blocking condition.

CThe virtual machine has 6 vCPUs assigned.Correct

SMP-FT in vSphere 6.x supports a maximum of 4 vCPUs per protected virtual machine; assigning 6 vCPUs exceeds that hard limit and the vSphere UI will prevent FT from being enabled on that VM until the vCPU count is reduced to within the supported threshold.

DThe virtual machine has a 1TB VMDK attached.

A 1TB VMDK size is not a documented restriction for SMP-FT; virtual disk capacity does not factor into the admission control checks that govern whether FT can be enabled.

EThe virtual machine has snapshots present.Correct

Fault Tolerance requires continuous real-time disk write logging to keep the secondary VM in sync, and snapshots introduce delta disk files (redo logs) that are incompatible with this synchronization mechanism - VMware blocks FT activation on any VM that has snapshots present.

Concept tested: SMP-FT vCPU limits and snapshot incompatibility requirements

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-57929CF8-5C43-4A9B-B22D-D8B5FB3D4CA6.html

Topics

#Fault Tolerance#SMP-FT#vCPU limits#snapshots

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