Which statements about dynamic reconstruction are true? (Multiple choice)

Question

Options

• AThe data redundancy decreases.
• BDynamic reconstruction is faster than ordinary reconstruction.
• CThe number of RAID members decreases.
• DThe number of RAID members remains unchanged.

• A
  7% (4)
• B
  77% (44)
• D
  16% (9)

Explanation

Dynamic reconstruction is a RAID recovery technique where, instead of waiting for a physical replacement drive, the system redistributes data across the remaining drives after a failure. This directly means the RAID member count shrinks (C), and since no hot-spare drive swap or physical insertion is needed, the process completes faster than ordinary reconstruction (B).

Why the distractors are wrong:

• A (redundancy decreases): Incorrect - the RAID level's protection scheme is maintained across the remaining members; the redundancy ratio stays the same even with fewer disks.
• D (member count unchanged): Directly contradicted by C - the defining trait of dynamic reconstruction is that it absorbs the lost drive's data into the surviving members, so the count must drop.

Memory tip: Think of the word "dynamic" as "on-the-fly shrink" - the array dynamically shrinks to surviving disks (fewer members = C) and skips waiting for a replacement disk entirely (faster = B). If you remember "shrink and sprint," you have both correct answers locked in.

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