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2V0-622 · Question #93

An administrator has created a resource pool named Marketing HTTP with a Memory Limit of 24 GB and a CPU Limit of 10,000 MHz. The Marketing HTTP resource pool contains three virtual machines: -Mktg-SQ

The correct answer is C. Only two of the three virtual machines can power on.. VMware resource pools enforce memory limits; when combined VM reservations exceed the pool's memory limit, not all VMs can power on.

Section 5 – Administer and Protect vSphere 6.5 Resources

Question

An administrator has created a resource pool named Marketing HTTP with a Memory Limit of 24 GB and a CPU Limit of 10,000 MHz. The Marketing HTTP resource pool contains three virtual machines:

-Mktg-SQL has a memory reservation of 16 GB. -Mktg-App has a memory reservation of 6 GB. -Mktg-Web has a memory reservation of 4 GB. What would happen if all three virtual machines are powered on?

Options

  • AAll three virtual machines can power on, but will have memory contention.
  • BAll three virtual machines can power on without memory contention.
  • COnly two of the three virtual machines can power on.
  • DOnly one of the virtual machines can power on.

How the community answered

(45 responses)
  • A
    7% (3)
  • B
    27% (12)
  • C
    51% (23)
  • D
    16% (7)

Why each option

VMware resource pools enforce memory limits; when combined VM reservations exceed the pool's memory limit, not all VMs can power on.

AAll three virtual machines can power on, but will have memory contention.

Memory contention applies when VMs compete for resources above their reservations, but here the 24 GB hard limit prevents all three VMs from powering on at all, not merely from experiencing contention.

BAll three virtual machines can power on without memory contention.

The total reservations (26 GB) exceed the 24 GB pool limit, so all three VMs cannot power on simultaneously regardless of contention state.

COnly two of the three virtual machines can power on.Correct

The three VMs have combined memory reservations of 26 GB (16 + 6 + 4), which exceeds the pool's 24 GB Memory Limit. vSphere cannot satisfy all reservations simultaneously because the limit acts as a hard cap on total resources available to the pool. As a result, only two VMs - whose combined reservations do not exceed 24 GB - can power on at the same time.

DOnly one of the virtual machines can power on.

Two VMs whose combined reservations do not exceed 24 GB can successfully power on together, so the pool is not restricted to just one VM.

Concept tested: vSphere resource pool memory limits and VM reservations

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-60077B40-66FF-4625-934A-641703ED7601.html

Topics

#resource pool#memory limit#memory reservation#VM power on

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