You are sizing an HPE Alletra Storage MP B10000 array (graphic provided).

Detailed Explanation:

Rationale for Correct Answer:

Changing HA from Drive Level to Enclosure Level means the system must reserve additional capacity to tolerate the loss of an entire disk enclosure. This decreases usable capacity, as more parity/spare space is required. Performance remains similar, but capacity overhead increases.

Distractors:

A: Multiple enclosures exist in the config; option is valid.

B: Switched vs direct-connect is unrelated to HA settings.

C: Performance estimates are not directly reduced by HA level change; capacity is.

Key Concept: Enclosure HA = more reserve overhead → less usable capacity.