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Difficulty: Very hardHigh Availability, Scalability, and Elasticity

An organization hosts a critical application on a single Azure Virtual Machine (VM) and configures Azure Autoscale to automatically increase the VM's compute size (CPU and memory) during peak traffic hours. Is the statement 'This automated setup demonstrates horizontal scaling and guarantees high availability' true or false?

Answer: Answer

Answer

The statement is false.
The statement is false because upgrading a single virtual machine's capacity is vertical scaling, and resizing requires a reboot, which interrupts the service.

Step-by-Step Solution

1
Identify the direction of the scaling operation described in the scenario.
The scenario describes increasing the CPU and memory of a single virtual machine, which is vertical scaling (scaling up).
Distinguishing between horizontal and vertical scaling is essential for evaluating the statement.
2
Analyze the service availability impact of resizing a single virtual machine.
Resizing an active Azure Virtual Machine requires a restart, causing temporary downtime.
Determining if the scaling action preserves continuous application access.
3
Assess whether the architecture meets high availability standards.
Because the application runs on a single instance without redundancy and undergoes reboots during scaling, high availability is not maintained.
Verifying the correctness of the overall statement.

Key Concept

The difference between vertical and horizontal scaling, and how single-instance resource changes affect high availability.
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Topics

High Availability, Scalability, and Elasticity

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