220-1201 Question #163: Real Exam Question with Answer & Explanation

Question

SIMULATION 4 A user reports poor performance on the application server. INSTRUCTIONS Click on Server 1 and Server 2 and review the information presented in each chart to determine which drives need to be replaced. Select the appropriate replacement drive that should be used, for the least performance degradation to the server. If at any time you would like to bring back the initial state of the simulation, please click the Reset All button. Answer: The degraded status on Server 2 indicates a RAID-5 issue, typically due to a failed or failing drive. In RAID-5 configurations, when one drive fails, the system can still operate but with reduced performance as parity data is used to rebuild missing data on-the-fly. Recommended Replacement Drive: - To minimize performance degradation, the replacement drive should be: - SAS HDD with the same specifications (64KB stripe size, no read-ahead, and write-back policy). - Matching the configuration exactly ensures seamless integration and optimizes recovery speed in the RAID-5 array. In RAID-5, degraded performance is expected when one drive fails, as parity data needs to rebuild missing information during each read/write process. Replacing the failed drive restores the RAID array to optimal status, reducing the load on existing drives and returning the system to normal read/write performance. The write-back policy and disabled disk cache settings are designed to reduce latency and increase efficiency, essential for handling real-time applications.

Explanation

This simulation requires diagnosing a RAID-5 degraded state on Server 2 due to a failed drive and selecting the appropriate replacement drive to restore full performance.

Common mistakes.

• A. Attempting to replace multiple drives simultaneously in a degraded RAID-5 array without proper procedure, or replacing a healthy drive, risks further data loss and complete array failure.

Concept tested. RAID 5 array management and drive replacement

Reference. https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/deploy-s2d-raid-5-6-support

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