Right-sizing resources in Azure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does 'right-sizing resources' mean in cloud computing?

Right-sizing resources means choosing the right amount of cloud resources (like CPU, memory, storage) to match the actual needs of your application or workload. It avoids paying for too much or too little.

beginner

Why is right-sizing important in Azure cloud?

Right-sizing helps reduce costs by avoiding over-provisioning and improves performance by ensuring resources are not under-provisioned. It also helps maintain efficient use of cloud services.

beginner

Name one Azure tool that helps with right-sizing resources.

Azure Advisor is a tool that analyzes your resource usage and provides recommendations to right-size your resources for better cost and performance.

intermediate

What is a sign that a virtual machine (VM) in Azure is over-provisioned?

If the VM's CPU and memory usage are consistently low, it means the VM is over-provisioned and you can consider downsizing it to save costs.

intermediate

How can right-sizing improve sustainability in cloud usage?

By using only the resources needed, right-sizing reduces waste and energy consumption, which helps lower the environmental impact of running cloud workloads.

What is the main goal of right-sizing resources in Azure?

A Avoid using any monitoring tools

B Always use the largest VM size available

C Match resource allocation to actual workload needs

D Increase resource usage to improve security

Right-sizing means matching resources to workload needs to optimize cost and performance.

Which Azure service provides recommendations for right-sizing?

A Azure Functions

B Azure DevOps

C Azure Blob Storage

D Azure Advisor

Azure Advisor analyzes usage and suggests right-sizing recommendations.

If a VM's CPU usage is very low over time, what should you consider?

A Downsizing the VM to a smaller size

B Upgrading the VM to a bigger size

C Deleting the VM immediately

D Ignoring the usage data

Low CPU usage suggests the VM is over-provisioned and can be downsized.

Right-sizing resources can help with which of the following?

A Increasing cloud waste

B Reducing cloud costs

C Making resources always idle

D Ignoring performance needs

Right-sizing reduces costs by avoiding paying for unused resources.

Which metric is NOT typically used to decide right-sizing?

A Network latency

B CPU utilization

C Memory usage

D Disk space usage

Network latency is not a direct indicator for right-sizing resource capacity.

Explain how you would use Azure tools to right-size a virtual machine.

Think about monitoring usage and following recommendations.

Describe the benefits of right-sizing resources in cloud infrastructure.

Consider cost, performance, and environmental impact.

Practice

1. What does right-sizing mean in Azure cloud resource management?

easy

A. Buying the largest possible resources to avoid any performance issues

B. Choosing the best size for your cloud resources to save cost and improve performance

C. Using only free-tier resources regardless of workload needs

D. Deleting unused resources without checking their usage

Solution

1. Step 1: Understand the term 'right-sizing'

   Right-sizing means selecting the most appropriate size of cloud resources based on actual workload needs.

2. Step 2: Identify the benefits of right-sizing

   It helps save money by avoiding over-provisioning and improves performance by matching resources to demand.

3. Final Answer:

   Choosing the best size for your cloud resources to save cost and improve performance -> Option B

4. Quick Check:

   Right-sizing = Best size choice [OK]

Hint: Right-sizing means matching resource size to workload needs [OK]

Common Mistakes:

• Thinking bigger is always better
• Ignoring cost savings
• Confusing right-sizing with deleting resources

2. Which Azure CLI command sequence correctly resizes a virtual machine named myVM to size Standard_DS2_v2?

easy

A. az vm stop --name myVM && az vm resize --name myVM --size Standard_DS2_v2 && az vm start --name myVM

B. az vm resize --name myVM --size Standard_DS2_v2 && az vm stop --name myVM && az vm start --name myVM

C. az vm start --name myVM && az vm resize --name myVM --size Standard_DS2_v2 && az vm stop --name myVM

D. az vm start --name myVM && az vm stop --name myVM && az vm resize --name myVM --size Standard_DS2_v2

Solution

1. Step 1: Stop the VM before resizing

   Azure requires the VM to be stopped before changing its size to avoid errors.

2. Step 2: Resize and then start the VM

   After stopping, resize the VM, then start it again to apply changes.

3. Final Answer:

   az vm stop --name myVM && az vm resize --name myVM --size Standard_DS2_v2 && az vm start --name myVM -> Option A

4. Quick Check:

   Stop, resize, start = correct order [OK]

Hint: Always stop VM before resizing, then start it [OK]

Common Mistakes:

• Trying to resize while VM is running
• Starting VM before resizing
• Wrong command order causing errors

3. Given this Azure CLI snippet, what will be the output status of the VM after execution?

az vm stop --name testVM && az vm resize --name testVM --size Standard_B1s && az vm start --name testVM && az vm show --name testVM --query "powerState" -o tsv

medium

A. VM will be running

B. VM will be stopped

C. VM will be deallocated

D. Command will fail due to wrong order

Solution

1. Step 1: Analyze command sequence

   The VM is stopped, resized, then started, and finally its power state is queried.

2. Step 2: Determine VM state after commands

   Since the VM is started before querying, the power state will show as running.

3. Final Answer:

   VM will be running -> Option A

4. Quick Check:

   Stop, resize, start, then check = running [OK]

Hint: Last command starts VM before checking state [OK]

Common Mistakes:

• Assuming VM stays stopped after start command
• Confusing deallocated with stopped
• Ignoring command order effects

4. You tried to resize an Azure VM using:

az vm resize --name myVM --size Standard_DS3_v2

but got an error. What is the most likely cause?

medium

A. You need to start the VM before resizing

B. The VM name is incorrect

C. The size Standard_DS3_v2 does not exist

D. The VM is currently running and must be stopped before resizing

Solution

1. Step 1: Understand Azure VM resize requirements

   Azure requires the VM to be stopped before resizing to avoid conflicts.

2. Step 2: Identify common error causes

   If the VM is running, resize commands fail with an error prompting to stop the VM first.

3. Final Answer:

   The VM is currently running and must be stopped before resizing -> Option D

4. Quick Check:

   VM must be stopped before resize [OK]

Hint: Stop VM before resizing to avoid errors [OK]

Common Mistakes:

• Trying to resize running VM
• Assuming VM name typo without checking
• Believing VM must be started before resize

5. You have a VM running with size Standard_DS4_v2 but your monitoring shows only 20% CPU usage consistently. Which is the best right-sizing approach to reduce costs without impacting performance?

hard

A. Resize the VM to Standard_DS1_v2 while it is running

B. Keep the current size since resizing may cause downtime

C. Resize the VM to Standard_DS2_v2 after stopping it, then start it again

D. Delete the VM and create a new smaller VM

Solution

1. Step 1: Analyze CPU usage and sizing

   Low CPU usage (20%) suggests the VM is over-provisioned and can be downsized safely.

2. Step 2: Choose a smaller size and follow correct resize steps

   Resizing to Standard_DS2_v2 reduces cost and maintains performance. Stop VM before resizing, then start it.

3. Final Answer:

   Resize the VM to Standard_DS2_v2 after stopping it, then start it again -> Option C

4. Quick Check:

   Stop, resize smaller, start = cost saving [OK]

Hint: Downsize VM after stopping to save cost safely [OK]

Common Mistakes:

• Resizing while VM is running
• Ignoring low CPU usage signals
• Deleting VM unnecessarily