Discover the most cost-effective EC2 instance purchase option for hosting a web server on Amazon AWS for one year without interruptions. Learn why Reserved Instances with Partial Upfront payment is the best choice.
Table of Contents
Question
A company needs to host a web server on Amazon EC2 instances for at least 1 year. The web server cannot tolerate interruptions. Which EC2 instance purchase option will meet these requirements in the MOST cost-effective way?
A. On-Demand Instances
B. Reserved Instances with Partial Upfront payment
C. Spot Instances
D. Reserved Instances with No Upfront payment
Answer
B. Reserved Instances with Partial Upfront payment
Explanation
Reserved Instances with Partial Upfront payment are the most cost-effective option for predictable workloads that require continuous operation.
When hosting a web server on Amazon EC2 for at least one year with no tolerance for interruptions, Reserved Instances with Partial Upfront payment is the most cost-effective and reliable choice. Here’s why:
On-Demand Instances (Option A)
- Pros: No upfront commitment; highly flexible.
- Cons: The most expensive option in the long term due to hourly or per-second billing rates.
- Use Case: Best suited for short-term, unpredictable workloads or development/testing environments.
Spot Instances (Option C)
- Pros: Offers up to 90% cost savings compared to On-Demand pricing.
- Cons: Spot Instances can be interrupted with only a two-minute warning if AWS needs the capacity, making them unsuitable for critical workloads like a web server that cannot tolerate downtime.
- Use Case: Ideal for fault-tolerant, flexible applications such as batch processing or data analysis.
Reserved Instances with No Upfront Payment (Option D)
- Pros: Provides cost savings over On-Demand pricing without requiring an upfront payment.
- Cons: While still cheaper than On-Demand, this option does not offer the same level of discount as Partial Upfront Reserved Instances. It is less cost-effective over a one-year term.
- Use Case: Suitable for organizations that want some savings but cannot afford upfront payments.
Reserved Instances with Partial Upfront Payment (Option B)
- Pros:
- Offers significant discounts (up to 72%) compared to On-Demand pricing.
- Guarantees capacity and availability for the chosen instance type and region.
- Ideal for long-term, steady-state workloads where interruptions are unacceptable.
- Cons: Requires an upfront payment, though it is smaller than Full Upfront Reserved Instances.
- Use Case: Perfect for predictable workloads like hosting a web server continuously over one year.
Why Option B Is the Best Choice
Reserved Instances with Partial Upfront payment strike the right balance between cost savings and operational reliability. By committing to a one-year term, you reduce costs significantly compared to On-Demand pricing while ensuring uninterrupted service—a critical requirement for hosting a web server. This option also provides flexibility in terms of upfront payment size compared to Full Upfront Reserved Instances, making it more accessible while still delivering substantial savings.
Choose Reserved Instances with Partial Upfront payment to meet your needs for a reliable, non-interruptible web server while optimizing costs effectively over a one-year period.
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