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Question 238 - SAA-C03 discussion

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A company runs an internal browser-based application The application runs on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group across multiple Availability Zones. The Auto Scaling group scales up to 20 instances during work hours but scales down to 2 instances overnight Staff are complaining that the application is very slow when the day begins although it runs well by mid-morning. How should the scaling be changed to address the staff complaints and keep costs to a minimum'?

A.
Implement a scheduled action that sets the desired capacity to 20 shortly before the office opens
Answers
A.
Implement a scheduled action that sets the desired capacity to 20 shortly before the office opens
B.
Implement a step scaling action triggered at a lower CPU threshold, and decrease the cooldown period.
Answers
B.
Implement a step scaling action triggered at a lower CPU threshold, and decrease the cooldown period.
C.
Implement a target tracking action triggered at a lower CPU threshold, and decrease the cooldown period.
Answers
C.
Implement a target tracking action triggered at a lower CPU threshold, and decrease the cooldown period.
D.
Implement a scheduled action that sets the minimum and maximum capacity to 20 shortly before the office opens
Answers
D.
Implement a scheduled action that sets the minimum and maximum capacity to 20 shortly before the office opens
Suggested answer: C

Explanation:

This option will scale up capacity faster in the morning to improve performance, but will still allow capacity to scale down during off hours. It achieves this as follows: * A target tracking action scales based on a CPU utilization target. By triggering at a lower CPU threshold in the morning, the Auto Scaling group will start scaling up sooner as traffic ramps up, launching instances before utilization gets too high and impacts performance. * Decreasing the cooldown period allows Auto Scaling to scale more aggressively, launching more instances faster until the target is reached. This speeds up the ramp-up of capacity. * However, unlike a scheduled action to set a fixed minimum/maximum capacity, with target tracking the group can still scale down during off hours based on demand. This helps minimize costs.


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asked 16/09/2024
Mita Balija
41 questions
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