Q23 — AWS SOA-C02 Ch.1

Question 23 of 100 | ← Chapter 1

A company is running an application on premises and wants to use AWS for data backup. All of the data must be available locally. The backup application can write only to block-based storage that is compatible with the Portable Operating System Interface (POSIX). Which backup solution will meet these requirements?

• A. Configure the backup software to use Amazon S3 as the target for the data backups.
• B. Configure the backup software to use Amazon S3 Glacier as the target for the data backups.
• C. Use AWS Storage Gateway, and configure it to use gateway-cached volumes.
• D. Use AWS Storage Gateway, and configure it to use gateway-stored volumes. ✓

Correct Answer: D. Use AWS Storage Gateway, and configure it to use gateway-stored volumes.

Explanation

AWS Storage Gateway的存储卷（gateway-stored volumes）模式将主数据保留在本地，同时将数据异步备份到Amazon S3。题目要求备份数据必须本地可用，且备份应用仅支持POSIX兼容的块存储。Amazon S3和S3 Glacier属于对象存储，不支持块存储接口。缓存卷（gateway-cached volumes）主要将数据存储在S3，本地仅缓存部分数据，无法满足全部数据本地可用的条件。存储卷模式确保数据完整存储在本地，并备份至AWS，兼容块存储，符合要求。AWS文档指出存储卷适用于需要低延迟访问本地数据集并需要云备份的场景。