220-1101 Question #323: Real Exam Question with Answer & Explanation

Question

A storage server with three drives was reporting errors indicating the array was in degraded mode, but the stored files were still accessible. A technician went to the server room to troubleshoot the error message. Which of the following RAID configurations did the technician MOST likely find?

Options

• ARAID 0
• BRAID 1
• CRAID 5
• DRAID 10

Explanation

A RAID 5 configuration provides fault tolerance using parity across three or more drives, allowing data access even when one drive fails (degraded mode).

Common mistakes.

• A. RAID 0 provides no fault tolerance; if one drive fails, all data in the array is lost and becomes inaccessible.
• B. RAID 1 (mirroring) requires a minimum of two drives, not three, and while it provides fault tolerance, the question describes a three-drive array and degraded mode with accessible files, which points more directly to RAID 5's parity scheme.
• D. RAID 10 (or RAID 1+0) requires a minimum of four drives, as it is a stripe of mirrors, and the scenario describes a three-drive array.

Concept tested. RAID 5 fault tolerance and degraded mode

Reference. https://learn.microsoft.com/en-us/windows-server/storage/disk-management/raid-levels

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