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Difficulty: EasyAWS Pricing Models

A retail company wants to run a marketing analytics application on Amazon EC2 for a temporary promotion that will last exactly 4 days. The application runs continuously, cannot tolerate any service interruptions, and the company wants to avoid any upfront payments or long-term contract commitments. Which EC2 pricing model is the most cost-effective option for this workload?

  1. A
    Spot Instances
  2. On-Demand InstancesAnswer
  3. C
    Reserved Instances
  4. D
    Dedicated Hosts

Answer

On-Demand Instances
On-Demand Instances are ideal for short-term, unpredictable, or spikey workloads that cannot be interrupted, as they require no upfront payment or long-term commitment and are billed per second or hour.

Step-by-Step Solution

1
Analyze the workload requirements: the application must run continuously for a short duration (4 days), cannot tolerate interruptions, and needs to avoid long-term commitments.
This rules out Spot Instances (due to interruptions) and Reserved Instances (due to long-term commitments).
Spot Instances can be reclaimed by AWS, and Reserved Instances require a 1-year or 3-year term commitment.
2
Compare On-Demand Instances against Dedicated Hosts.
On-Demand Instances offer the required flexibility and low cost for standard virtual machines without the overhead of physical host dedication.
Dedicated Hosts are physical servers dedicated for use by a single customer and are significantly more expensive, which is not required here.

Key Concept

Matching Amazon EC2 pricing models to short-term, uninterrupted workloads without long-term commitments.
Estimated Time:45s
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Topics

AWS Pricing Models

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