What needs to be replaced in case of a local memory DIMM failure on a Hitachi Unified Storage controller?

Question

Options

• Athe controller
• Bthe local memory DIMM
• Cthe controller and the local memory DIMM
• Dthe controller, the local memory DIMM and the cache DIMMs

• B
  4% (1)
• C
  92% (23)
• D
  4% (1)

Explanation

On Hitachi Unified Storage (HUS) controllers, the local memory DIMM is tightly integrated with the controller hardware - it cannot be swapped in isolation, so both the controller and the local memory DIMM (C) must be replaced together as a combined field replacement unit (FRU).

Why the distractors are wrong:

• A (controller only) is incomplete - the failed DIMM itself must also be addressed, not just the controller chassis.
• B (DIMM only) is wrong because the local memory DIMM is not a standalone-replaceable component on HUS controllers; the controller must go with it.
• D (controller + DIMM + cache DIMMs) over-scopes the replacement - cache DIMMs are separate, independently replaceable components and are not implicated by a local memory failure alone.

Memory tip: Think of the local memory DIMM as "married" to the controller - they ship and fail together. Cache DIMMs, by contrast, are "roommates" - separate and independently swappable. If the question mentions local memory, the answer always pairs the DIMM with its controller.

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