A cloud administrator has deployed a new all-flash storage array with deduplication and compression enabled, and moved some of the VMs into it. The goal was to achieve 4:1 storage efficiency while…

Question

Options

• ACompression 1:1Deduplication 4:1Overall savings 4:1Average latency 1.0ms
• BCompression 1.5:1Deduplication 1.8:1Overall savings 2.2:1Average latency 600us
• CCompression 1.3:1Deduplication 3.1:1Overall savings 4.3:1Average latency 900us
• DCompression 1.8:1Deduplication 2.7:1Overall savings 4.2:1Average latency 1.2ms

• A
  9% (2)
• B
  35% (8)
• C
  13% (3)
• D
  43% (10)

Explanation

The two stated requirements are (1) 4:1 overall storage efficiency and (2) sub-millisecond latency (strictly less than 1ms = less than 1000 microseconds). Evaluating each option: Option A achieves 4:1 efficiency but 1.0ms latency, which is not sub-millisecond. Option B achieves only 2.2:1 efficiency, failing the storage goal. Option C achieves 4.3:1 overall savings (exceeding the 4:1 target) with 900us latency (which IS sub-millisecond, since 900us < 1000us). Option D achieves 4.2:1 efficiency but 1.2ms latency, which exceeds 1ms and therefore FAILS the sub-millisecond requirement. The correct answer that satisfies both requirements is C, not D. D should be eliminated because 1.2ms > 1ms violates the sub-millisecond latency constraint.

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