NS0-157 · Question #262
Which NetApp Virtual Storage Tier component works aggregate-wide on a FAS controller?
The correct answer is B. Flash Cache. Flash Cache is a controller-level PCIe read cache that operates across all aggregates on a FAS node, unlike Flash Pool which is scoped to a single aggregate.
Question
Which NetApp Virtual Storage Tier component works aggregate-wide on a FAS controller?
Options
- AFlash I/O
- BFlash Cache
- CFlash Accel
- DFlash Disk
- EFlash Pool
How the community answered
(60 responses)- A5% (3)
- B92% (55)
- D2% (1)
- E2% (1)
Why each option
Flash Cache is a controller-level PCIe read cache that operates across all aggregates on a FAS node, unlike Flash Pool which is scoped to a single aggregate.
Flash I/O is not a defined NetApp Virtual Storage Tier product; it does not correspond to any recognized VST component.
Flash Cache is a PCIe-based intelligent read cache installed in the FAS controller itself, caching random read data for all aggregates hosted on that node. Because it is a controller-wide resource rather than an aggregate-specific one, it benefits every aggregate on the FAS node simultaneously.
Flash Accel is a host-side PCIe flash caching solution deployed on the application server, not a FAS controller component.
Flash Disk is a colloquial reference to SSD drives used in Flash Pool configurations, not a distinct controller-level VST tier.
Flash Pool is scoped to a single hybrid aggregate and only accelerates I/O for that specific aggregate, not all aggregates on the controller.
Concept tested: NetApp Flash Cache controller-level read caching
Source: https://docs.netapp.com/us-en/ontap/performance-admin/enable-disable-flash-cache-task.html
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