nerdexam
Broadcom-VMware

2V0-621D · Question #248

An administrator is configuring resource pools for a vSphere 6.x cluster. The cluster has these characteristics: - Five ESXi 6.x hosts - Six cores per host - 70 virtual machines with 1 vCPU each The a

The correct answer is C. Virtual machines in all resource pools will perform equally.. During contention, each virtual machine across all three resource pools will receive an equivalent proportion of CPU resources because, despite the varying pool share values, the number of virtual machines in each pool normalizes the per-VM share value.

Section 7 – Administer and Analyze vSphere 6.x Performance

Question

An administrator is configuring resource pools for a vSphere 6.x cluster. The cluster has these characteristics:

  • Five ESXi 6.x hosts
  • Six cores per host
  • 70 virtual machines with 1 vCPU each

The administrator configures three resource pools and places the virtual machines into the pools, as follows:

  • Production pool - High Share value with 40 virtual machines
  • Infrastructure pool - Medium Share value with 20 virtual machines
  • Development pool - Low Share value with 10 virtual machines

Given this configuration, what is the expected performance for each group of virtual machines during contention?

Options

  • AVirtual machines in the Production pool will perform two times as well as those in the
  • BVirtual machines in the Infrastructure pool will perform four times as well as those in the
  • CVirtual machines in all resource pools will perform equally.
  • DVirtual machines in the Development pool will perform two times as well as those in the

How the community answered

(32 responses)
  • A
    19% (6)
  • B
    16% (5)
  • C
    59% (19)
  • D
    6% (2)

Why each option

During contention, each virtual machine across all three resource pools will receive an equivalent proportion of CPU resources because, despite the varying pool share values, the number of virtual machines in each pool normalizes the per-VM share value.

AVirtual machines in the Production pool will perform two times as well as those in the

This is incorrect because the per-VM share value is equal across all pools, not favoring the Production pool two times over others in a normalized context.

BVirtual machines in the Infrastructure pool will perform four times as well as those in the

This is incorrect as the per-VM share value is equal across all pools, not favoring the Infrastructure pool four times over others.

CVirtual machines in all resource pools will perform equally.Correct

When resource pools are configured with shares, the actual resource allocation during contention is proportional to the total shares within the pool. In this scenario, dividing the total shares of each pool by the number of VMs within that pool (Production: 4000/40 = 100, Infrastructure: 2000/20 = 100, Development: 1000/10 = 100) shows that each individual virtual machine effectively has the same share value, leading to equal performance.

DVirtual machines in the Development pool will perform two times as well as those in the

This is incorrect as the per-VM share value is equal across all pools, meaning the Development pool VMs will not perform two times as well.

Concept tested: vSphere resource pool shares per-VM calculation

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-9580662D-C343-4C78-AE34-C82DD7145781.html

Topics

#Resource Pools#CPU Shares#CPU Overcommitment#VM Performance

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full 2V0-621D Practice