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2V0-622D · Question #86

An administrator has noticed that virtual machine VM2 in the vApp shown in the Exhibit is demonstrating poor performance. Which three changes, if performed separately, would improve the performance of

The correct answer is A. Remove the CPU limit on the vApp. D. Power off virtual machine VM1. E. Increase the CPU reservation on virtual machine VM2.. A CPU limit on a vApp creates an aggregate ceiling on all VMs inside it, and VM2's performance improves by removing that ceiling, eliminating VM1 as a competing consumer, or guaranteeing VM2 a minimum entitlement.

Section 7 – Administer and Analyze vSphere 6.5 Performance

Question

An administrator has noticed that virtual machine VM2 in the vApp shown in the Exhibit is demonstrating poor performance. Which three changes, if performed separately, would improve the performance of VM2? (Choose three.)

Exhibit

2V0-622D question #86 exhibit

Options

  • ARemove the CPU limit on the vApp.
  • BRemove the CPU limit on the resource pool.
  • CIncrease the CPU reservation on virtual machine VM1.
  • DPower off virtual machine VM1.
  • EIncrease the CPU reservation on virtual machine VM2.

How the community answered

(34 responses)
  • A
    68% (23)
  • B
    12% (4)
  • C
    21% (7)

Why each option

A CPU limit on a vApp creates an aggregate ceiling on all VMs inside it, and VM2's performance improves by removing that ceiling, eliminating VM1 as a competing consumer, or guaranteeing VM2 a minimum entitlement.

ARemove the CPU limit on the vApp.Correct

Removing the CPU limit on the vApp eliminates the container-level cap that restricts combined CPU access for all VMs inside it, allowing VM2 to consume cycles that were previously blocked by the aggregate limit.

BRemove the CPU limit on the resource pool.

The exhibit places the binding constraint at the vApp CPU limit, not at a separate parent resource pool limit, so removing a resource pool limit above the vApp would not change the CPU available to VM2.

CIncrease the CPU reservation on virtual machine VM1.

Increasing VM1's CPU reservation raises the minimum CPU that must be held for VM1, which reduces the uncommitted pool available to VM2 and would worsen VM2's performance.

DPower off virtual machine VM1.Correct

Powering off VM1 removes it as a CPU consumer within the vApp, freeing cycles inside the existing limit so VM2 can use a larger portion of the available allocation without any policy change.

EIncrease the CPU reservation on virtual machine VM2.Correct

Increasing VM2's CPU reservation establishes a guaranteed minimum entitlement for it, ensuring the hypervisor schedules those cycles for VM2 even under contention from VM1 or the vApp limit.

Concept tested: vApp CPU limits, reservations, and inter-VM resource contention

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-E025F5EB-5C78-4A47-8F00-3D5893FDA4B9.html

Topics

#vApp#resource pool#CPU limit#VM performance

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