NS0-157 · Question #294
Which of the following statements is true about a Flash Pool?
The correct answer is C. A 64 bit aggregate containing SSDs and HDDs. A Flash Pool is a hybrid aggregate that pairs SSDs as a cache tier with HDDs for capacity, and requires the 64-bit aggregate format.
Question
Which of the following statements is true about a Flash Pool?
Options
- AA 32 bit or 64 bit aggregate containing SSDs and HDDs
- BA 32 bit aggregate containing SSDs and HDDs
- CA 64 bit aggregate containing SSDs and HDDs
- DA 64 bit aggregate containing only SSDs
How the community answered
(29 responses)- A7% (2)
- B3% (1)
- C86% (25)
- D3% (1)
Why each option
A Flash Pool is a hybrid aggregate that pairs SSDs as a cache tier with HDDs for capacity, and requires the 64-bit aggregate format.
Flash Pool cannot be a 32-bit aggregate; the 32-bit format lacks the structural support for the hybrid SSD cache layer that defines Flash Pool.
A 32-bit aggregate is incorrect for Flash Pool - only 64-bit aggregates support the Flash Pool feature in ONTAP.
A Flash Pool is a 64-bit aggregate that contains both SSDs (serving as a high-performance write and read cache) and HDDs (providing primary storage capacity). The 64-bit aggregate format is required because it supports the larger address space and metadata structures needed for the hybrid caching architecture.
An aggregate containing only SSDs is an All Flash FAS or AFF configuration, not a Flash Pool, which by definition requires the combination of SSDs and HDDs.
Concept tested: NetApp Flash Pool hybrid aggregate architecture
Source: https://docs.netapp.com/us-en/ontap/disks-aggregates/flash-pool-aggregate-caching-policies-concept.html
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