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CV0-002 · Question #58

A company is migrating their physical servers to virtual. The administrator is tasked with migrating three servers: One application server with a dual-core 3.2GHz processor that reaches 50% CPU…

The correct answer is A. 1,600 MHz for the application server and 2,300 MHz for each web server. To determine the best minimum CPU resources, calculate the required MHz based on the physical core speed and peak utilization of each server being virtualized.

Deployment

Question

A company is migrating their physical servers to virtual. The administrator is tasked with migrating three servers:

One application server with a dual-core 3.2GHz processor that reaches 50% CPU utilization at peak time. Two web servers, each with a dual-core 3.2GHz processor, both reaching 70% CPU utilization at peak time. Currently, the administrator only has two hosts available, so resources will need to be set for the new VMs. Each host has two 2.4GHz quad-core processors. One host is already near maximum capacity, and the second host is at 30% CPU utilization. Which of the following would be the BEST minimum CPU resources set on the second host for the new VMs?

Options

  • A1,600 MHz for the application server and 2,300 MHz for each web server.
  • B3,300 MHz for the application server and 4,600 MHz for each web server.
  • C3,300 MHz for the application server and 5,250 MHz for each web server.
  • D5,250 MHz for the application server and 7,080 MHZ for each web server.

How the community answered

(31 responses)
  • A
    58% (18)
  • B
    6% (2)
  • C
    23% (7)
  • D
    13% (4)

Why each option

To determine the best minimum CPU resources, calculate the required MHz based on the physical core speed and peak utilization of each server being virtualized.

A1,600 MHz for the application server and 2,300 MHz for each web server.Correct

The application server's peak utilization of 50% of a 3.2GHz core requires 3.2GHz multiplied by 0.50, which equals 1.6GHz or 1600 MHz. Each web server's peak utilization of 70% of a 3.2GHz core requires 3.2GHz multiplied by 0.70, which equals 2.24GHz, best approximated by 2300 MHz for practical sizing.

B3,300 MHz for the application server and 4,600 MHz for each web server.

This option suggests significantly higher MHz values for both server types, indicating an incorrect calculation method, such as provisioning for the total dual-core capacity rather than a per-core utilization equivalent.

C3,300 MHz for the application server and 5,250 MHz for each web server.

This option allocates excessively high MHz values for the web server compared to its peak utilization, leading to over-provisioning of resources.

D5,250 MHz for the application server and 7,080 MHZ for each web server.

This option proposes CPU allocations that are far greater than the actual peak utilization of the physical servers, representing significant over-provisioning.

Concept tested: Virtual machine CPU sizing and resource allocation

Source: https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/plan/plan-hyper-v-scalability-in-windows-server-2016

Topics

#virtualization#capacity planning#CPU allocation#P2V migration

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