Which of the following statements about improving performance of OceanStor pacific is not correct? (Single-choice)

Question

Options

• ASmall I/Os can be written to the cache to complete the write request
• BSmall I/Os are aggregation in the cache
• CSmall I/Os are encoded in EC mode and then flushed to disks
• DRandom writes are changed to sequential writes

• A
  12% (7)
• B
  7% (4)
• C
  78% (45)
• D
  3% (2)

Explanation

Option C is incorrect because small I/Os are not individually EC-encoded before being flushed to disk. EC (Erasure Coding) encoding is a compute-intensive process that is applied after small I/Os have been aggregated into larger chunks in the cache - encoding raw small I/Os directly would be highly inefficient and defeat the purpose of caching.

• A is correct: Writing small I/Os to cache is exactly the first step - the cache absorbs incoming small writes quickly, satisfying the write request from the host's perspective.
• B is correct: The cache aggregates (coalesces) multiple small I/Os into larger, more efficient blocks - this is the key performance optimization for small I/O workloads.
• D is correct: By aggregating random small I/Os in cache, the resulting flush to disk becomes a large, sequential write, dramatically improving disk throughput.

Memory tip: Think of the cache as a "waiting room" - small I/Os check in (A), sit together until there are enough of them (B), then leave as one organized group in a single file (D → sequential write). EC encoding only happens on that organized group, not on individual arrivals walking in the door - so C reverses the order of operations.

No community discussion yet for this question.