When using “Cluster resource percentage” for host failover capacity in vSphere HA Admission Control, the total
resource requirements are calculated from which two values? (Choose two.)
A.
Total vCPUs assigned to each VM.
B.
Average CPU usage on each VM over time.
C.
Memory reservations on each VM.
D.
Total memory assigned to each VM.
E.
Average active memory on each VM over time.
F.
CPU reservations on each VM.
Explanation:
http://www.enterprisedaddy.com/2016/10/vmware-vsphere-6-5-new-features-ha/
C,f
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Cluster Resources Percentage Admission Control:
The total resource requirements for the powered-on virtual machines is comprised of two components, CPU and memory.
The CPU component – by summing the CPU reservations of the powered-on virtual machines.
The memory component – by summing the memory reservation (plus memory overhead) of each powered-on virtual machine.
Slot Policy Admission Control:
Slot size is comprised of two components, CPU and memory.
vSphere HA calculates the CPU component by obtaining the CPU reservation of each powered-on virtual machine and selecting the largest value.
vSphere HA calculates the memory component by obtaining the memory reservation, plus memory overhead, of each powered-on virtual machine and selecting the largest value.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.avail.doc/GUID-53F6938C-96E5-4F67-9A6E-479F5A894571.html
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Correct: CF
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A & D
This policy calculates the
amount of failover capacity to reserve by using a percentage of the total available CPU and memory resources in
the cluster. To further simplify the configuration, this percentage is now calculated automatically by defining the
number of host failures to tolerate (FTT).
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Answer is C and F:
The total resource requirements for the powered-on virtual machines is comprised of two components, CPU and memory. vSphere HA calculates these values:
-The CPU component by summing the CPU reservations of the powered-on virtual machines. If you have not specified a CPU reservation for a virtual machine, it is assigned a default value of 32MHz (this value can be changed using the das.vmcpuminmhz advanced option.)
-The memory component by summing the memory reservation (plus memory overhead) of each powered-on virtual machine.
Reference: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.avail.doc/GUID-FAFEFEFF-56F7-4CDF-A682-FC3C62A29A95.html
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Also from that document:
With the cluster resources percentage option, vSphere HA enforces admission control as follows:
– Calculates the total resource requirements for all powered-on virtual machines in the cluster.
– Calculates the total host resources available for virtual machines.
– Calculates the Current CPU Failover Capacity and Current Memory Failover Capacity for the cluster.
– Determines if either the Current CPU Failover Capacity or Current Memory Failover Capacity is less than the corresponding Configured Failover Capacity (provided by the user).
– If so, admission control disallows the operation.
vSphere HA uses the actual reservations of the virtual machines. If a virtual machine does not have reservations, meaning that the reservation is 0, a default of 0MB memory and 32MHz CPU is applied.
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