Azure DevTest Labs vs Reserved VMs for Short-Term VMs

AZ-900 By islever Editorial Last updated

Describe features and tools for managing and deploying Azure resources

Short answer

B Azure Reserved VM Instances are a long-term billing discount, not a tool for automating short-term VM lifecycle management.

Question

Note: The question is included in a number of questions that depicts the identical set-up. However, every question has a distinctive result. Establish if
the solution satisfies the requirements.
Your company's developers intend to deploy a large number of custom virtual machines on a weekly basis. They will also be removing these virtual machines
during the same week it was deployed. Sixty percent of the virtual machines have Windows Server 2016 installed, while the other forty percent has Ubuntu Linux
installed.
You are required to make sure that the administrative effort, needed for this process, is reduced by employing a suitable Azure service.
Solution: You recommend the use of Azure Reserved Virtual Machines (VM) Instances.
Does the solution meet the goal?
  1. Yes
  2. No Correct Answer

Key Takeaways

The trap is confusing a billing discount (Reserved Instances) with an operational solution (DevTest Labs) designed to automate and reduce administrative effort for ephemeral environments.

This question evaluates the suitability of Azure Reserved VM Instances for short-lived workloads. The correct answer is B because Reserved Instances are a cost-saving pricing model, not a deployment management tool.

Common mistake: Many learners choose 'Yes' assuming any Azure service helps with VMs, failing to recognize that Reserved Instances require long-term commitments incompatible with weekly removal.

Expert Analysis

Why the Answer Is Correct

The solution does not meet the goal because Azure Reserved Virtual Machine (VM) Instances are a billing commitment, not a management tool. Reserved VMs provide discounts in exchange for a one- or three-year term commitment, which contradicts the requirement of deploying and removing VMs on a weekly basis. You cannot effectively use a long-term reservation for short-lived, disposable resources.

Why the Other Options Are Wrong

Option A is incorrect because the administrative effort would actually increase or remain high without a management layer, and the cost structure is mismatched. There is no option C or D; the binary choice relies on understanding the fundamental purpose of Reserved Instances versus services like Azure DevTest Labs, which are specifically designed for creating reusable templates and managing lifecycle of test/dev VMs efficiently.

Community Comment Notes

Community consensus strongly supports Option B. Users highlight that Reserved Instances are for "consistent resource usage" and that they are a "pricing plan," not a deployment tool. Several comments explicitly mention that Azure DevTest Labs would be the appropriate solution for this scenario (Comments 1, 9), confirming that the proposed solution fails to address the administrative efficiency requirement.

Exam Strategy

Always distinguish between pricing models (like Reserved Instances or Savings Plans) and operational tools (like DevTest Labs or Automation Accounts). If a question asks about reducing administrative effort for frequent creation/deletion, look for automation or lab services, not billing discounts.

Frequently Asked Questions

Why are Reserved VMs bad for weekly VMs?

Reserved VMs require a 1-3 year commitment. Deploying and deleting VMs weekly makes this commitment impractical and financially wasteful.

What Azure service should I use instead?

Azure DevTest Labs is ideal for this scenario as it allows reusable templates and artifacts to reduce administrative effort for dev/test VMs.

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Discussion 28 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 28

  1. ddponder 👍 38
    The correct answer is B. Azure DevTest Labs enable you to quickly create environments using reusable templates and artifacts.
  2. SyedAadRazaDevops 👍 26
    An Azure Reserved Virtual Machine Instance (RI) is a virtual machine (VM) on the Microsoft Azure public cloud that has been reserved for dedicated use on a one- or three-year basis. ... Azure RIs are available for all Azure VM types, except for the A-series, A_v2 series and the G-series
  3. AntonioTech 👍 14
    The answer is B. No Azure Reserved Virtual Machine (VM) Instances are not the most suitable solution for deploying and managing a large number of custom virtual machines on a weekly basis that are also removed during the same week. Reserved VM Instances are used to save costs by committing to a specific VM instance type for a one- or three-year term, which is not aligned with the short-term and frequent deployment and removal pattern described in your scenario. To reduce administrative effort for your specific use case, you might consider using Azure DevTest Labs. Azure DevTest Labs allows you to quickly create environments in Azure while managing costs by setting up policies for resource usage. You can create a lab that aligns with your requirements, including Windows Server and Ubuntu Linux VMs, and allow your developers to deploy and remove VMs easily in a controlled environment. Therefore, the solution of using Azure Reserved VM Instances does not meet the goal of reducing administrative effort for deploying and managing a large number of custom virtual machines on a weekly basis that are also removed within the same week.
  4. Kanders 👍 6
    B. No - do not agree this meets the goal due to Azure Reserved Instances are an Azure pricing plan that can help reduce cloud costs. It offers discounts in return for a commitment to use Azure offerings for a duration of one or three years. Azure Reservations are ideal for workloads with a consistent resource usage.
  5. AoifeK98 👍 5
    asked 28.9.21
Show 23 more comments
  1. Tanat 👍 4
    Azure Reserved Virtual Machine Instances is compared to pay-as-you-go prices—with one-year or three-year terms on Wi ndows and Linux virtual machines (VMs). https://docs.microsoft.com/en-us/azure/availability-zones/az-overview
  2. buiducvu 👍 3 Answered B
    B. No . Reserved not a tool, it is a method pricing
  3. kate_py 👍 2
    ... —with one-year or three-year terms on Windows and Linux virtual machines (VMs). https://azure.microsoft.com/en-us/pricing/reserved-vm-instances/ Apparently this is not for fast provisioning and removing VMs.
  4. ElPitu97 👍 2 Answered B
    B-NO DEVTESTLAB SHOULD BE THE ANSWER
  5. GeeKaizer1 👍 2
    B is the correct answer.
  6. Mahanad 👍 1 Answered B
    Azure Reserved VM Instances provide discounted pricing when you commit to using specific virtual machine resources for a one-year or three-year term. They are not designed to automate frequent deployment and removal of VMs. In this scenario, the developers create and delete many custom VMs every week, so the appropriate solution is Azure Automation, which can reduce administrative effort by automating VM deployment and removal.
  7. descentguy2021 👍 1 Answered B
    No, the solution using Azure Reserved VM Instances does not meet the goal. Azure Reserved VM Instances are designed for long-term cost savings on predictable workloads, not for the rapid deployment and removal of virtual machines as described. A better solution would be Azure DevTest Labs or Virtual Machine Scale Sets, which are designed for these types of scenarios, according to Azure documentation.
  8. kahla 👍 1 Answered B
    Azure Reserved Virtual Machine Instances provide cost savings through long-term VM usage commitments but do not reduce administrative effort for deploying and deleting many custom VMs on a weekly basis. Given the frequent VM lifecycle changes, RIs are neither suitable nor helpful in automation or administration reduction.
  9. arjunyv2022 👍 1 Answered B
    Azure Reserved VM Instances are not suited for short-term, frequently changing workloads, the given solution does not meet the goal.
  10. Pefl 👍 1 Answered B
    respuesta correcta es B. Azure DevTest Labs te permite crear entornos rápidamente usando plantillas y artefactos reutilizables.
  11. Said Ismail 👍 1 Answered B
    The correct answer is B. Azure DevTest Labs enable you to quickly create environments using reusable templates and artifacts
  12. Jas001 👍 1 Answered B
    Azure Dev Test Labs for test and development. Azure Virtual Machine Scale Sets for production
  13. Luansi 👍 1 Answered B
    https://azure.microsoft.com/en-us/pricing/reserved-vm-instances/
  14. intentando 👍 1 Answered B
    https://azure.microsoft.com/en-us/products/devtest-lab
  15. Zaidsdb 👍 1 Answered B
    only the azure devtest labs can do it
  16. Jotess 👍 1
    The correct answer is B.
  17. Logan987 👍 1 Answered B
    B is the correct answer
  18. MarMar2022 👍 1 Answered B
    Not the right tool. B.
  19. mitddgr 👍 1 Answered B
    Azure DevTest Labs.
  20. AWSum1 👍 1 Answered B
    Keyword is Reserved
  21. rameshsee 👍 1
    Selected Answer: B
  22. RaySmith 👍 1
    Answer is: B
  23. dt_go 👍 1 Answered B
    correct

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