AWS Solutions Architect Associate Practice Test

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What is the availability percentage of RRS in S3?

  1. 99.999999999%

  2. 100%

  3. 99%

  4. 99.99%

The correct answer is: 99.99%

The availability percentage of Reduced Redundancy Storage (RRS) in Amazon S3 is 99.99%. RRS is designed for data that can be easily reproduced, which means it offers lower resilience compared to other S3 storage classes like Standard Storage that provides higher durability and availability percentages (up to 99.999999999% or 11 nines). When considering the use of RRS, it is important to understand that while it is cost-effective for certain use cases, such as when storing transient, non-critical data, it does not afford the same level of redundancy as other storage options. This lower availability percentage indicates that users should implement additional safeguards, such as regular backups or replication strategies when working with RRS, especially for data that may have significant consequences if lost. Thus, the choice of 99.99% accurately reflects the expected availability performance of RRS, making it suitable for applications where high availability is not the top priority but cost savings are a consideration.