AWS Certified Solutions Architect Professional SAP-C02 Practice Question
A data analytics platform runs on Amazon EC2 instances. Each instance was provisioned with a 1-TiB General Purpose SSD (gp2) Amazon EBS volume to guarantee a baseline performance of 3,000 IOPS. A recent cost review determined that while the 3,000 IOPS baseline must be maintained for periodic queries, the storage is underutilized. The team has been tasked with reducing the monthly storage costs for these volumes without changing their size and without causing any downtime for the attached instances.
Which solution meets these requirements MOST cost-effectively?
Purchase a Compute Savings Plan to cover the EC2 instances.
Provision new 1-TiB Throughput Optimized HDD (st1) volumes and migrate the data.
Use Amazon EBS Elastic Volumes to modify each volume from the gp2 type to the gp3 type.
Use Amazon EBS Elastic Volumes to modify each volume to a Provisioned IOPS SSD (io2) volume configured for 3,000 IOPS.
General Purpose SSD (gp3) volumes offer a significant cost advantage over gp2 volumes, typically being about 20% less expensive per GiB. Crucially, gp3 volumes provide a baseline performance of 3,000 IOPS and 125 MiB/s of throughput, regardless of their size. This meets the 3,000 IOPS requirement without needing a large 1-TiB volume. Using the Amazon EBS Elastic Volumes feature, an existing gp2 volume can be converted to gp3 without detaching it from the instance or scheduling downtime. This action directly reduces monthly costs while preserving the required IOPS baseline. Migrating to an io2 volume would be more expensive. Keeping the gp2 volume would be more expensive than switching to the more cost-effective gp3 volume type for storage. st1 volumes are for throughput-intensive workloads and would not meet the IOPS requirement.
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