What are the two bitmap locations used by the Memory Management Layer during LU format in Hitachi Unified Storage systems? (Choose two.)

Question

Options

• ASSD on the Cache Memory Adapter
• Bin the RAID group upon creation
• Cswapped in and out of cache as needed
• Din Cache Memory Adapter Master Partition 0

Explanation

The correct answers are A and D.

During LU format in Hitachi Unified Storage systems, the Memory Management Layer maintains two bitmap copies for redundancy and persistence: one on the SSD on the Cache Memory Adapter (A), which provides non-volatile storage that survives power loss, and one in Cache Memory Adapter Master Partition 0 (D), a reserved system area designated for critical metadata like format tracking.

Option B is incorrect - RAID groups are data storage constructs, not locations where the MML stores its operational bitmaps; the bitmap tracks format progress, not RAID configuration. Option C is incorrect because it describes a cache behavior (paging), not a specific physical or logical storage location - the whole point of storing bitmaps in these two locations is persistence, the opposite of being transiently swapped.

Memory tip: Both correct answers point to the Cache Memory Adapter (CMA) - think "CMA keeps the map." The SSD gives physical persistence, and Master Partition 0 gives a dedicated logical home. If an answer doesn't reference the CMA, it's likely a distractor.

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