NS0-158 · Question #7
What is an array LUN?
The correct answer is D. a LUN provisioned on third-party storage that ONTAP will use in a RAID group. An array LUN is a LUN created on external, third-party storage that NetApp ONTAP then imports and uses as if it were a physical disk to build its own RAID groups and aggregates.
Question
What is an array LUN?
Options
- Aa LUN provisioned in ONTAP that is mounted by a connected host
- Ba LUN provisioned on third-party storage that ONTAP will use as a pass through LUN
- Ca LUN that is used only as a part of a volume group
- Da LUN provisioned on third-party storage that ONTAP will use in a RAID group
How the community answered
(34 responses)- A3% (1)
- B6% (2)
- C3% (1)
- D88% (30)
Why each option
An array LUN is a LUN created on external, third-party storage that NetApp ONTAP then imports and uses as if it were a physical disk to build its own RAID groups and aggregates.
This describes a standard ONTAP-provisioned LUN, not an array LUN, which is externally sourced.
An array LUN is more than just a pass-through; it becomes a fundamental building block (like a disk) for ONTAP's aggregates and volumes.
While an array LUN might indirectly contribute to volumes in a volume group, its fundamental definition is about how ONTAP integrates external storage into its base aggregate structure, not merely its use in volume groups.
An array LUN is a logical unit that originates from a third-party storage array and is then consumed by NetApp ONTAP, where it is incorporated into an ONTAP RAID group, acting as a 'disk' to form an aggregate.
Concept tested: NetApp ONTAP FlexArray / Foreign LUN Import (FLI) and array LUN concept.
Source: https://docs.netapp.com/us-en/ontap-9/storage/storage-virtualization/concept_what_foreign_lun_import_is.html
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