A storage administrator needs to create a LUSE volume on a VSP storage system. Which two volume types are used for this task? (Choose two.)

Question

Options

• Apool volumes
• BDP volumes
• Cbasic volumes
• Dexternal volumes

• A
  4% (2)
• B
  2% (1)
• C
  93% (43)

Explanation

LUSE (LUN Size Expansion) on Hitachi VSP works by concatenating multiple volumes of fixed, real capacity into one larger logical volume. Basic volumes (C) are internal volumes allocated directly from parity groups with defined physical space, and external volumes (D) are real-capacity volumes imported from external storage via Universal Volume Manager - both qualify as LUSE candidates because they have concrete, pre-allocated capacity that can be chained together.

Pool volumes (A) are wrong because they exist solely to back a Dynamic Provisioning pool; they are consumed internally by the pool mechanism and cannot be directly presented or concatenated into a LUSE. DP volumes (B) are wrong because they are thin-provisioned virtual volumes that draw on-demand from a pool - their capacity is not pre-allocated, making them incompatible with LUSE's fixed-size concatenation model.

Memory tip: LUSE needs volumes with real, committed capacity - remember "Basic + External = LUSE-able". If a volume type involves pools or thin provisioning (Pool, DP), it cannot be concatenated into a LUSE.

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