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Exam Professional Cloud Architect topic 1 question 155 discussion

Actual exam question from Google's Professional Cloud Architect

Question #: 155
Topic #: 1

[All Professional Cloud Architect Questions]

You are migrating third-party applications from optimized on-premises virtual machines to Google Cloud. You are unsure about the optimum CPU and memory options. The applications have a consistent usage pattern across multiple weeks. You want to optimize resource usage for the lowest cost. What should you do?

A. Create an instance template with the smallest available machine type, and use an image of the third-party application taken from a current on-premises virtual machine. Create a managed instance group that uses average CPU utilization to autoscale the number of instances in the group. Modify the average CPU utilization threshold to optimize the number of instances running.
B. Create an App Engine flexible environment, and deploy the third-party application using a Dockerfile and a custom runtime. Set CPU and memory options similar to your application's current on-premises virtual machine in the app.yaml file.
C. Create multiple Compute Engine instances with varying CPU and memory options. Install the Cloud Monitoring agent, and deploy the third-party application on each of them. Run a load test with high traffic levels on the application, and use the results to determine the optimal settings.
D. Create a Compute Engine instance with CPU and memory options similar to your application's current on-premises virtual machine. Install the Cloud Monitoring agent, and deploy the third-party application. Run a load test with normal traffic levels on the application, and follow the Rightsizing Recommendations in the Cloud Console.

Show Suggested Answer

Suggested Answer: D 🗳️

by SweetieS at Aug. 24, 2021, 1:23 p.m.

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pr2web

Highly Voted 3 years, 3 months ago

Answer is D. https://cloud.google.com/migrate/compute-engine/docs/4.9/concepts/planning-a-migration/cloud-instance-rightsizing?hl=en "Rightsizing provides two types of recommendations: 1. Performance-based recommendations: Recommends Compute Engine instances based on the CPU and RAM currently allocated to the on-premises VM. This recommendation is the default. 2. Cost-based recommendations: Recommends Compute Engine instances based on: - The current CPU and RAM configuration of the on-premises VM. - The average usage of this VM during a given period. To use this option, you must activate rightsizing monitoring with vSphere for this group of VMs and allow time for Migrate for Compute Engine to analyze usage.

upvoted 56 times

melono

2 years, 2 months ago

The point: 2. Cost-based recommendations: Recommends Compute Engine instances based on: The current CPU and RAM configuration of the on-premises VM.

upvoted 1 times

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cloudmon

Highly Voted 2 years, 8 months ago

Selected Answer: D

It's definitely D. See the reference at the following link that says "The recommendation algorithm is suited to workloads that follow weekly patterns", which matches the part of the questions that says "consistent usage pattern over multiple weeks": https://cloud.google.com/compute/docs/instances/apply-machine-type-recommendations-for-instances Option A also has two problems; 1. It only focuses on CPU, but the question says "CPU and memory" 2. The question does not mention anything about horizontal scalability

upvoted 9 times

cloudmon

2 years, 8 months ago

Another (less obvious) reason for choosing D: I've noticed a pattern in these exams that the cloud provider wants to advertise and promote anything that they consider to be a cool feature of their platform. In this case, they are promoting their recommendation engine. If there's even an option that sounds like it's advertising a relevant managed service from the cloud provider, then that's usually one to consider.

upvoted 4 times

cloudmon

2 years, 8 months ago

I also find the following wording in option A to be a bit iffy: "an image of the third-party application taken from a current on-premises virtual machine". That seems a bit vague in terms of what the image format would be.

upvoted 1 times

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e5019c6

Most Recent 1 year ago

Selected Answer: D

I choose A at first, because I thought that the Rightsizing Recommendations took various days to offer the estimate stats. But according to this article: https://cloud.google.com/migrate/compute-engine/docs/4.11/concepts/planning-a-migration/cloud-instance-rightsizing While it needs a week to give a proper estimate, it can give an estimate with less time too (But the accuracy decreases) "For better recommendations, Migrate for Compute Engine recommends monitoring the migrated workloads for at least seven consecutive days (or one typical business week). Migrate for Compute Engine warns you when the monitoring period is insufficient for an adequate recommendation. Even if the monitoring period is insufficient, Migrate for Compute Engine still offers a cost-optimized recommendation based on the data available."

upvoted 3 times

e5019c6

1 year ago

Also note that Migrate to Virtual Machines v4.11 (Which the info is from) is no longer the latest version. V5 is already out and, strangely, lacks any article about rightsizing recommendations...

upvoted 2 times

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2 years, 2 months ago

D is correct

upvoted 1 times

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SerGCP

2 years, 3 months ago

Selected Answer: D

A, application may not support horizontal scaling and may not run in instances whith small cpu B, dockerize third-party applications is not a requirement....Complex and costly C, too expensive D, simple and works

upvoted 3 times

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shekarcfc

2 years, 3 months ago

Selected Answer: A

A, the benefit of moving to cloud is scaling based on load, start with min infra and scale-up based on usage.

upvoted 4 times

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amxexam

2 years, 7 months ago

Selected Answer: D

A - you cannot expect application to behavior similar in 2 different envior met without a test. B - App Engine is costly C- Varing cpu and memory cannot be doone. D- correa.

upvoted 3 times

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