Dell EMC Associate – Information Storage and Management v4 — Question 2

What is an accurate statement about variable prefetching?

Answer options

• A. Many blocks that have recently been written to storage by the compute system are retrieved and placed in cache.
• B. Many non-contiguous blocks that are not currently required can be retrieved from cache in advance.
• C. Storage system prefetches data in multiples of the original I/O request size from the compute system.
• D. Storage system prefetches many non-contiguous blocks of data, with varied sizes, from cache.

Correct answer: D

Explanation

The correct answer, D, accurately reflects that variable prefetching involves retrieving non-contiguous blocks of data from cache with various sizes. Option A is incorrect because it refers to blocks written to storage rather than prefetching. Option B is misleading as it implies prefetching of blocks that are not needed at all, and option C inaccurately describes the size of the data being prefetched.