AWS Certified Solutions Architect – Professional — Question 203

What RAID method is used on the Cloud Block Storage back-end to implement a very high level of reliability and performance?

Answer options

• A. RAID 1 (Mirror)
• B. RAID 5 (Blocks striped, distributed parity)
• C. RAID 10 (Blocks mirrored and striped)
• D. RAID 2 (Bit level striping)

Correct answer: C

Explanation

RAID 10 combines the advantages of both mirroring and striping, providing high availability and improved performance by distributing data across multiple disks. RAID 1 offers redundancy but lacks the performance benefits of striping, while RAID 5 provides a balance of redundancy and performance but is not as effective as RAID 10 for high-demand applications. RAID 2 is rarely used in practice and does not offer the same level of performance as the other options.