How does a Dell Unity XT array with dynamic pools rebuild failed drives?

Question

Options

• AInvokes the array global spare
• BInvokes the hot spare associated with the pool
• CUses vault drive space until the failed drive is replaced
• DUses spare space reserved within the pool

• A
  7% (4)
• B
  2% (1)
• C
  5% (3)
• D
  86% (49)

Explanation

Dell Unity XT dynamic pools distribute spare capacity across all drives in the pool rather than dedicating physical spare drives. When a drive fails, the array immediately begins rebuilding data using this pre-allocated spare space already residing within the pool itself - no physical spare drive is required, and recovery starts without waiting for human intervention or drive replacement.

Why the distractors are wrong:

• A (global spare): Global spares are a traditional concept for legacy RAID groups; dynamic pools don't rely on a single idle standby drive shared across the system.
• B (hot spare associated with the pool): Dynamic pools have no dedicated hot spare drive tied to them - the "spare" is distributed space, not a physical disk sitting idle.
• C (vault drive space): Vault drives store system metadata and are reserved for Unity's internal use, not for drive rebuild operations.

Memory tip: Think of dynamic pools as having "spare space baked in" - like keeping empty slots in a filing cabinet rather than a spare cabinet waiting in the hallway. The space is inside the pool, not outside it. The keyword is reserved within, which maps directly to choice D.

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