HP HPE7-J02 Exam With Confidence Using Practice Dumps

Detailed Explanation:

Rationale for Correct Answer:

In Alletra 5000/6000 sizing, the Failure Domain Reserve (FDR) is used to account for rebuild overhead in case of drive failure. HPE best practices define that, unless otherwise directed by the sizing tool or customer requirements, the minimum FDR value should be set to 23% of the largest drive size. This ensures enough reserve capacity for fault tolerance and sustained performance during rebuilds.

Distractors:

B/C: Low-read latency is influenced by cache and workload profile, not by arbitrary FDR percentages.

D: Using the smallest drive is incorrect — rebuild impact must be sized against the largest drive.

Key Concept: FDR sizing based on 23% of largest drive = HPE best practice.

Detailed Explanation:

Rationale for Correct Answer:

Frequent cache misses occur when the working dataset does not fit effectively in cache. Increasing the flash-to-disk ratio ensures a higher portion of hot data is served from flash media rather than backend disk, reducing cache miss penalties. This is the standard HPE recommendation for read-intensive workloads where cache is insufficient.

Distractors:

A: Adding shelves adds capacity, not cache-to-data efficiency.

B: Upgrading controllers increases CPU, but not necessarily cache efficiency.

C: Pinned cache is intended for metadata or specific workloads, not large-scale read caching.

Key Concept: Flash-to-disk ratio optimization reduces cache misses.