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Difficulty: HardUnderstand concepts of cloud economics

A software-as-a-service (SaaS) startup is launching a new application on AWS. The workload is expected to be highly variable, with unpredictable traffic spikes throughout the day. The startup's Chief Financial Officer (CFO) wants to minimize up-front infrastructure costs and ensure that the company only pays for the compute resources it actually consumes. Which of the following strategies aligns with AWS cloud economics to meet the CFO's requirements?

  1. Deploying the application using an elastic architecture that automatically scales resources in response to demand, converting fixed capital expenses (CapEx) into variable operating expenses (OpEx).Answer
  2. B
    Pre-purchasing a fixed capacity of dedicated physical servers located in AWS data centers to establish a long-term capital expense (CapEx), which eliminates monthly variable bills.
  3. C
    Configuring a static, over-provisioned cluster of On-Demand instances to guarantee performance during peak hours, representing a capital expense (CapEx) that depreciates over time.
  4. D
    Deploying the database tier entirely on Spot Instances to ensure a guaranteed, low-cost baseline resource pool that is immune to unexpected terminations.

Answer

Deploying the application using an elastic architecture that automatically scales resources in response to demand, converting fixed capital expenses (CapEx) into variable operating expenses (OpEx).
The strategy of deploying an elastic architecture that scales dynamically based on real-time demand allows the startup to pay only for the resources they consume. This represents a shift from capital expenses (CapEx) to variable operating expenses (OpEx), which is a key concept of cloud economics.

Step-by-Step Solution

1
Identify the CFO's financial constraints and requirements.
The CFO wants to minimize up-front infrastructure costs (avoid CapEx) and pay only for consumed capacity (leverage variable costs/elasticity).
This defines the target economic criteria to evaluate the options.
2
Analyze the economic impact of static vs. elastic architectures in the cloud.
An elastic architecture scales resources down when demand is low, preventing charges for idle capacity and representing a variable operating expense (OpEx).
This determines how elasticity affects TCO.
3
Evaluate the billing and operational characteristics of the options.
Only the option utilizing an elastic architecture to transition from CapEx to OpEx satisfies both the avoidance of up-front costs and the dynamic matching of capacity to demand.
This confirms the correct choice based on cloud economic principles.

Key Concept

Shifting capital expenses (CapEx) to operating expenses (OpEx) through elasticity
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Understand concepts of cloud economics

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