Thanks to Anti-affinity rules, VMware Fault Tolerant virtual machines are?
A.
Never located within the same cluster
B.
Sometimes located on the same host, but only in a powered off state
C.
Never located on the same host
D.
Sometimes located on the same host if an HA event occurs
I think the correct answer is
C. Never located on the same host.
Ref: http://www.vmware.com/pdf/vsphere4/r40/vsp_40_availability.pdf
Page 32:
“A fault tolerant virtual machine and its secondary copy are not allowed to run on the same host. Fault Tolerance
uses anti-affinity rules, which ensure that the two instances of the fault tolerant virtual machine are never on
the same host. This ensures that a host failure cannot result in the loss of both virtual machines.”
Answer is B:
NOTE The anti-affinity check is performed when the Primary VM is powered on. It is possible that the Primary
and Secondary VMs can be on the same host when they are both in a powered-off state. This is normal behavior
and when the Primary VM is powered on, the Secondary VM is started on a different host at that time.
Source: http://www.vmware.com/pdf/vsphere4/r40/vsp_40_availability.pdf and also relevant 4.1 paper