HAT-420 · Question #101
Which three parameters must be set when adding a Cache Partition on a Hitachi Unified Storage system? (Choose three.)
On a Hitachi Unified Storage (HUS) system, adding a Cache Partition requires specifying the RAID Group (B), Cache Size (C), and Segment Size (D) - these three define where the cache applies, how much is allocated, and at what granularity it operates. RAID Group is required…
Question
Which three parameters must be set when adding a Cache Partition on a Hitachi Unified Storage system? (Choose three.)
Options
- AController
- BRaid Group
- CCache Size
- DSegment Size
- ELogical Unit
Explanation
On a Hitachi Unified Storage (HUS) system, adding a Cache Partition requires specifying the RAID Group (B), Cache Size (C), and Segment Size (D) - these three define where the cache applies, how much is allocated, and at what granularity it operates. RAID Group is required because cache partitions are associated at the RAID group level, allowing targeted performance tuning for specific groups of drives. Cache Size sets the amount of shared cache reserved for that partition, while Segment Size determines the unit of cache allocation and directly affects hit efficiency.
Why the distractors are wrong: Controller (A) is not a required input - HUS cache management abstracts away individual controller assignment. Logical Unit (E) is a distractor because cache partitions are bound to RAID Groups, not individual LUs; LU-level cache behavior is inherited from the partition assigned to its parent RAID Group.
Memory tip: Think "RCS" - RAID Group, Cache Size, Segment Size - the three things that answer where, how much, and how fine for any cache partition on HUS.
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