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2V0-622 · Question #181

Which two scenarios would cause a Fault Tolerance-enabled virtual machine to fail to power the Secondary virtual machine? (Choose two.)

The correct answer is A. The host has entered a Network Partitioned state. B. vSphere High Availability (HA) is disabled on the host cluster.. Fault Tolerance requires both vSphere HA to be enabled on the cluster and uninterrupted network connectivity; the absence of either prevents the Secondary VM from being powered on.

Section 6 – Administer vSphere 6.5 Availability

Question

Which two scenarios would cause a Fault Tolerance-enabled virtual machine to fail to power the Secondary virtual machine? (Choose two.)

Options

  • AThe host has entered a Network Partitioned state.
  • BvSphere High Availability (HA) is disabled on the host cluster.
  • CEnhanced vMotion Compatibility (EVC) is enabled on the host cluster.
  • DvSphere Distributed Power Management (DPM) is enabled on the host cluster.

How the community answered

(50 responses)
  • A
    42% (21)
  • C
    18% (9)
  • D
    40% (20)

Why each option

Fault Tolerance requires both vSphere HA to be enabled on the cluster and uninterrupted network connectivity; the absence of either prevents the Secondary VM from being powered on.

AThe host has entered a Network Partitioned state.Correct

If a host enters a Network Partitioned state, the FT logging network used to synchronize state between the Primary and Secondary VM is severed, causing the Secondary VM to fail to power on or be maintained because synchronization cannot be established.

BvSphere High Availability (HA) is disabled on the host cluster.Correct

vSphere FT is built on top of the vSphere HA framework and requires HA to be enabled on the cluster; disabling HA removes the infrastructure that FT depends on to monitor and place the Secondary VM, preventing it from powering on.

CEnhanced vMotion Compatibility (EVC) is enabled on the host cluster.

Enhanced vMotion Compatibility is actually required or recommended for FT environments because it enforces CPU feature consistency across cluster hosts, which FT depends on - it does not prevent the Secondary VM from powering on.

DvSphere Distributed Power Management (DPM) is enabled on the host cluster.

Distributed Power Management may place idle hosts in standby mode but does not prevent FT from powering a Secondary VM on any remaining active host in the cluster.

Concept tested: vSphere FT Secondary VM power-on prerequisites

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-57929CF8-B8BC-4E28-9593-8F4E5E7AA7BA.html

Topics

#Fault Tolerance#HA cluster#network partition#DPM

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