Dell-EMC
E20-885 · Question #85
You review a Unisphere Analyzer report from a customer's EMC VNX. You observe that disk read activity is higher than can be accounted for from host reads and normal pre-fetch activity. What is the…
The correct answer is A. Writes on the array are reasonably sequential, but there is not enough data in cache to fill each. See the full explanation below for the reasoning.
Question
You review a Unisphere Analyzer report from a customer's EMC VNX. You observe that disk read activity is higher than can be accounted for from host reads and normal pre-fetch activity. What is the likely cause?
Options
- AWrites on the array are reasonably sequential, but there is not enough data in cache to fill each
- BIndividual writes are being requested and sequenced until the entire stripe is cached and parity is
- CDisk crossings and stripe crossings are normal events where large I/O is involved.
- DThe Unisphere Analyzer report was run against the wrong storage processor.
How the community answered
(34 responses)- A79% (27)
- B3% (1)
- C6% (2)
- D12% (4)
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