What happens if vSphere Fault Tolerance is enabled for a virtual machine in a DRS/HA cluster, but Host Monitor

What happens if vSphere Fault Tolerance is enabled for a virtual machine in a DRS/HA cluster, but Host Monitoring is not enabled for vSphere HA?

A.
Anti-affinity rules for the FT virtual machine cannot be upheld, and both the primary and secondary FT virtual machine might reside on the same host.

B.
Memory reservations for the FT virtual machine cannot be upheld, and sufficient resources might not be available to restore redundancy if an HA event occurs.

C.
If the primary FT virtual machine fails, the secondary FT virtual machine does not take over.

D.
If the primary FT virtual machine fails, a new secondary FT virtual machine is not created and the virtual machine is no longer redundant.

6 Comments on “What happens if vSphere Fault Tolerance is enabled for a virtual machine in a DRS/HA cluster, but Host Monitor

  1. Mohsin Alvi says:

    If the primary FT virtual machine fails, a new secondary FT virtual machine is not created ???
    when FT enable, at the time Secondary machine is also created on another host

    1. sam says:

      agreed, FT is not vmotion, it is like a mirror (replication), pardon the terminological, the Secondary machine has to be exited, please clarify. thx.

    1. sam says:

      can you explain why?
      It could be C:
      bcz HA is the dependency of FT, without HA, if a DR event occurred, the secondary vm simply wont be turned on, therefore, no failed-over.

  2. Rich says:

    Pretty sure it’s C. FT requires HA, if HA is not enabled, a failure of the host that runs the primary will not be detected and the secondary won’t take over.

  3. Phil says:

    It is D.

    VMware HA must be enabled on the cluster. Host Monitoring should also be enabled. If it is not, when Fault Tolerance uses a Secondary VM to replace a Primary VM no new Secondary VM is created and redundancy is not restored.


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