A company hosts a production workload on a fleet of Amazon EC2 t3.medium Linux instances i… — AWS Certified SysOps Administrator - Associate

A company hosts a production workload on a fleet of Amazon EC2 $t3.medium$ Linux instances in the $us-east-1$ region. The workload runs $24/7$ , and the company plans to migrate the fleet to $t4g.medium$ instances within the next $3$ months. The company wants to optimize costs immediately by committing to a $1$ -year term, ensuring that the discount applies to the current $t3$ instances and automatically transitions to the new $t4g$ instances post-migration. Which purchasing option will meet these requirements at the lowest cost?

Purchase a $1$ -year Compute Savings Plan.Answer
B
Purchase a $1$ -year EC2 Instance Savings Plan for the $t3$ instance family.
C
Purchase a $1$ -year EC2 Instance Savings Plan for the $t4g$ instance family.
D
Purchase a $1$ -year Standard Reserved Instance for the $t3$ instance family.

Answer

Purchase a

1

-year Compute Savings Plan.

The correct answer is purchasing a

1

-year Compute Savings Plan because it provides the necessary flexibility to automatically apply discounts across different EC2 instance families (from

t3

t4g

) during the term of the agreement, covering the instances both before and after the migration.

Step-by-Step Solution

Analyze the workload characteristics and migration path.

The current workload runs on

t3

instances, but will migrate to

t4g

instances within the next

3

months during a

1

-year commitment window.

This establishes that the discount mechanism must support a change in instance families (from

t3

t4g

) mid-term without losing the applied savings.

Evaluate the flexibility of different AWS pricing models.

EC2 Instance Savings Plans and Standard Reserved Instances are locked to specific instance families within a region. Only Compute Savings Plans allow changes across instance families, regions, operating systems, and tenancies.

This rules out EC2 Instance Savings Plans and Standard RIs as they cannot span the transition from

t3

t4g

without incurring wasted commitment or On-Demand rates.

Select the option that covers both phases of the migration at the lowest cost.

1

-year Compute Savings Plan immediately applies to the active

t3

instances and seamlessly transitions to cover the

t4g

instances after the migration, preventing any gap in discount coverage.

This satisfies all operational constraints and ensures the maximum possible cost savings throughout the entire

1

-year term.

Key Concept

Compute Savings Plans offer the flexibility to change instance families (e.g.,

t3

t4g

) during the commitment term, whereas EC2 Instance Savings Plans and Standard Reserved Instances restrict discounts to a single instance family.

Question

Answer

Step-by-Step Solution

Key Concept

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