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A system administrator needs to control the allocation of memory and CPU resources to an organization’s Finance team. The vSphere environment is built on a single cluster of ESXi hosts.
Which feature can be used to accomplish this task?
A. Resource Pool Reservations
B. DRS set to Fully Automated
C. Virtual Machine Shares
D. DRS Virtual Machine Groups
Correct Answer: A
Explanation/Reference:
Explanation:
We can use a resource pool reservation to ensure that enough memory and CPU resources are ‘reserved’ on the ESXi cluster for use by the Finance team’s virtual machines.
A resource pool is a logical grouping of the resources (Memory, CPUs etc.) on an ESXi host or cluster. Resource pools can be grouped into hierarchies and used to hierarchically partition available CPU and memory resources.
Each standalone host and each DRS cluster has an (invisible) root resource pool that groups the resources of that host or cluster. Users can create child resource pools of the root resource pool or of any user-created child resource pool.
When configuring a resource pool, you can also configure a “Reservation”. A reservation reserves a defined amount of CPU or memory resource to be used by the resource pool. The reserved resources cannot be used by VMs in another resource pool even if the resources are unused.
Incorrect Answers:
B: DRS in automated mode will move VMs between the hosts to balance the load across the hosts. However, this does not guarantee that the required resources are available in the cluster for the VMs. Therefore, this answer is incorrect.
C: Virtual Machine shares are used to determine how memory and CPU resources are shared between the VMs when resource contention occurs. A VM with higher shares than another VM will get more resources. However, this does not guarantee that the required resources are available in the cluster for the VMs. Therefore, this answer is incorrect.
D: DRS Virtual Machine Groups are used with affinity rules to group VMs together on a host or keep groups of VMs apart if required. DRS VM groups do not guarantee that the required resources are available in the cluster for VMs. Therefore, this answer is incorrect.
References:
https://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.resmgmt.doc/GUID-0F6C6709-A5DA-4D38-BE08-6CB1002DD13D.html