What are two advantages of the Memory Management Layer (MML) in Hitachi Unified Storage systems? (Choose two.)

Question

Options

• AMetada for MML-supported functions is copied to cache only when needed for processing.
• BLU quick and normal format speeds are increased.
• CThe DM-LU size is automatically adjusted depending upon the number of copy pairs.
• DCopy-on-Write Snapshot and TrueCopy Extended Distance no longer require a data pool for

Explanation

Based on Hitachi Unified Storage documentation, the correct answers are A and D.

A is correct because MML optimizes cache utilization by loading metadata only on-demand - rather than pre-loading all metadata into cache at startup, MML brings metadata into cache only when a supported function actually requires it, reducing wasted cache capacity.

D is correct because a key MML advantage is that Copy-on-Write Snapshot and TrueCopy Extended Distance operations can leverage MML-managed metadata structures instead of requiring a separately allocated data pool, simplifying configuration and reducing overhead.

B is wrong because LU format speeds are influenced by drive/controller performance and format type, not by the MML layer - MML manages metadata in cache, not LU formatting operations.

C is wrong because automatic DM-LU sizing based on copy pair count is a feature of the Dynamic Mapping LU provisioning mechanism, not a benefit of MML itself.

Memory tip: Think of MML as a "just-in-time librarian" - it fetches metadata books off the shelf only when someone needs them (A), and reorganizes the library so some sections no longer need their own storage room (D). If an answer sounds like it's about disk speed or pool sizing automation, it's almost certainly a distractor.

No community discussion yet for this question.