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2V0-620 · Question #54

An attempt to enable vSphere Fault Tolerance for a powered-on virtual machine fails. Which two scenarios would result in this failure? (Choose two.)

The correct answer is B. The host on which the virtual machine is running has insufficient memory resources. C. The virtual machine has insufficient resources to accommodate full reservation plus the overhead. vSphere Fault Tolerance fails to enable when the host lacks sufficient memory to support the secondary VM or when the VM cannot accommodate the full memory reservation FT requires.

Section 4 – Deploy and Administer VMware Virtual Machines

Question

An attempt to enable vSphere Fault Tolerance for a powered-on virtual machine fails. Which two scenarios would result in this failure? (Choose two.)

Options

  • AThe virtual machine has three vCPUs configured.
  • BThe host on which the virtual machine is running has insufficient memory resources.
  • CThe virtual machine has insufficient resources to accommodate full reservation plus the overhead
  • DVMware High Availability is enabled on the cluster of which this host is a member.

How the community answered

(51 responses)
  • A
    20% (10)
  • B
    73% (37)
  • D
    8% (4)

Why each option

vSphere Fault Tolerance fails to enable when the host lacks sufficient memory to support the secondary VM or when the VM cannot accommodate the full memory reservation FT requires.

AThe virtual machine has three vCPUs configured.

Modern vSphere FT supports up to 8 vCPUs per VM, so a VM configured with 3 vCPUs is well within the supported limit and would not cause enablement to fail.

BThe host on which the virtual machine is running has insufficient memory resources.Correct

FT requires that a secondary VM be powered on simultaneously on another host, and that host must have enough free memory to support it - if memory is insufficient, vCenter cannot place the secondary VM and FT enablement fails.

CThe virtual machine has insufficient resources to accommodate full reservation plus the overheadCorrect

FT mandates a full memory reservation equal to the VM's configured memory plus overhead; if the cluster or host cannot satisfy this reservation, the FT enablement process is rejected with an insufficient resources error.

DVMware High Availability is enabled on the cluster of which this host is a member.

VMware High Availability must actually be enabled on the cluster as a prerequisite for Fault Tolerance - having HA enabled is a requirement, not a cause of failure.

Concept tested: vSphere Fault Tolerance prerequisites and resource requirements

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-57929CF0-DA9B-407A-BF2E-E7B72708D825.html

Topics

#Fault Tolerance#FT prerequisites#memory reservation#vCPU requirements

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