A storage administrator cannot enable the deduplication feature on a LUN from a hybrid pool within a Dell Unity XT 380 array. What is the cause of this problem?

Question

Options

• ADeduplication is not supported on hybrid arrays.
• BThe feature must be enabled at the system level.
• CThe pool does not have enough flash capacity.

• A
  11% (4)
• B
  19% (7)
• C
  69% (25)

Explanation

On Dell Unity XT systems, deduplication is a flash-dependent feature - it requires the pool to have adequate flash (SSD) capacity to store and process the deduplication metadata efficiently. A hybrid pool mixes flash and spinning disk drives, and if the flash tier is insufficient, the array simply cannot enable deduplication on LUNs provisioned from that pool.

Why A is wrong: Deduplication is supported on hybrid pools in Unity XT - the issue is a capacity constraint, not an architectural limitation.

Why B is wrong: Deduplication is configured at the pool or LUN level, not the system level; there is no system-wide toggle that gates the feature.

Memory tip: Think "Dedupe demands flash" - deduplication metadata is I/O-intensive, so Unity XT ties the feature directly to available flash capacity. If the flash tier is too small, the feature is blocked.

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