A system administrator needs to configure a virtual machine to guarantee that it always gets the appropriate resources even if the host is overloaded and overcommitted. Which setting on the virtual machine does the administrator need to configure?
The answer is not A. vSphere HA Admission Control
HA Admission Control is set on the cluster, not on a VM. The question states, "Which setting on the VM does the admin need to configure?" With that in mind, the option that best answers the question is D. CPU and Memory Reservations. Please read both links below for more detail.
vSphere HA Admission Control Info:
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-53F6938C-96E5-4F67-9A6E-479F5A894571.html
Resource Allocation Reservation Info:
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-8B88D3D8-E9D9-4C05-A065-B3DE1FFFB401.html?hWord=N4IghgNiBcIE4FMDOC4DcwBcCWB7AdkiAL5A
To ensure that a virtual machine consistently receives its required resources regardless of host overcommitment and load, the system administrator should configure:
D. CPU and Memory Reservations
Reservations allow you to guarantee a minimum allocation of CPU and memory resources for a particular virtual machine, ensuring that even if the host becomes overloaded or overcommitted, the specified resources will always be available for that VM. This setting provides a dedicated minimum allocation that cannot be consumed by other VMs, thereby maintaining the specified level of performance for the designated virtual machine.
D
The basis for vSphere HA admission control is how many host failures your cluster is allowed to tolerate and still guarantee failover. The host failover capacity can be set in three ways:
D. CPU and Memory Reservations is the setting that the administrator needs to configure on the virtual machine to guarantee that it always gets the appropriate resources even if the host is overloaded and overcommitted. The CPU and memory reservations set a guaranteed amount of CPU and memory resources that will be reserved for the virtual machine, regardless of the resource utilization on the host. This ensures that the virtual machine always has access to the resources it needs, even if other virtual machines or the host are using more resources than they have been allocated.
In comparison, setting CPU and Memory Shares to High, using vSphere High Availability Admission Control, or using the High Performance Power Policy only affect the relative priority of the virtual machine when competing for resources with other virtual machines. They do not guarantee a minimum amount of resources for the virtual machine.
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