Which two features make use of the Memory Management Layer in a Hitachi Unified Storage system? (Choose two.)

Question

Options

• AQuick Format
• BNormal Format
• CCache Residency
• DShadowImage

Explanation

Cache Residency (C) and ShadowImage (D) are the two features that utilize the Memory Management Layer (MML) in Hitachi Unified Storage systems. Cache Residency leverages the MML directly to pin designated volumes or data in cache, ensuring they remain resident in memory rather than being evicted under normal cache management rules. ShadowImage (Hitachi's local point-in-time copy feature) uses the MML to coordinate pair operations and manage data consistency between source and shadow volumes through the cache layer.

Why the distractors are wrong: Quick Format (A) and Normal Format (B) are volume initialization operations - they write data patterns to storage blocks but do not interact with the Memory Management Layer as a functional dependency; they operate at the physical/logical volume level rather than the cache management layer.

Memory tip: Think "M" for Memory - Cache Residency Controlling Residence (staying in memory) and ShadowImage Splitting through the System memory layer. If a feature is fundamentally about what lives in cache or how cache-backed copies are managed, it's an MML feature - format operations just blast data to disk.

No community discussion yet for this question.