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2V0-621 · 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. vSphere Fault Tolerance requires HA to be enabled and depends on network connectivity; both a network partition and disabled HA prevent the Secondary VM from powering on.

Section 6 – Administer vSphere 6.x 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

(23 responses)
  • A
    83% (19)
  • C
    4% (1)
  • D
    13% (3)

Why each option

vSphere Fault Tolerance requires HA to be enabled and depends on network connectivity; both a network partition and disabled HA prevent the Secondary VM from powering on.

AThe host has entered a Network Partitioned state.Correct

A network-partitioned state breaks the required network communication channel between the Primary and Secondary FT VMs, making it impossible for the Secondary to synchronize state with and successfully power on alongside the Primary.

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

vSphere FT has a hard dependency on vSphere HA being enabled on the cluster - without HA, the FT framework that manages Secondary VM placement, heartbeat monitoring, and failover orchestration cannot operate, so the Secondary VM will not power on.

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

Enhanced vMotion Compatibility (EVC) normalizes CPU instruction sets across hosts to enable cross-host migrations; it does not block FT Secondary VM power-on and is actually beneficial for FT in mixed-CPU clusters.

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

While DPM can power down underutilized hosts, its presence on the cluster does not inherently prevent FT from powering on a Secondary VM - FT and DPM can coexist, though FT VMs are excluded from DPM standby consideration.

Concept tested: vSphere Fault Tolerance prerequisites and failure conditions

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#Secondary VM#HA#network partition

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