Q91 — AWS SOA-C02 Ch.1

Question 91 of 100 | ← Chapter 1

A company runs hundreds of Amazon EC2 instances in a single AWS Region. Each EC2 instance has two attached 1 GiB General Purpose SSD (gp2) Amazon Elastic Block Store (Amazon EBS) volumes. A critical workload is using all the available IOPS capacity on the EBS volumes. According to company policy, the company cannot change instance types or EBS volume types without completing lengthy acceptance tests to validate that the company’s applications will function properly. A SysOps administrator needs to increase the I/O performance of the EBS volumes as quickly as possible. Which action should the SysOps administrator take to meet these requirements?

• A. Increase the size of the 1 GiB EBS volumes. ✓
• B. Add two additional elastic network interfaces on each EC2 instance.
• C. Turn on Transfer Acceleration on the EBS volumes in the Region.
• D. Add all the EC2 instances to a cluster placement group.

Correct Answer: A. Increase the size of the 1 GiB EBS volumes.

Explanation

本题核心考察AWS EPS gp2卷性能优化方式。gp2卷的IOPS性能与卷容量直接关联，计算公式为基准3IOPS/GiB（最低100 IOPS，最高16000 IOPS）。增加卷容量（选项A）可线性提升IOPS上限且无需变更卷类型或实例类型，符合政策限制；选项B/C涉及网络优化与EBS存储性能无关，选项D仅优化实例间通信，均不直接影响EBS IOPS。