Network_Appliance
NS0-157 · Question #415
NS0-157 Question #415: Real Exam Question with Answer & Explanation
The correct answer is B: 100 GB. A space-reserve enabled LUN on a thick-provisioned volume immediately allocates its full size, while a space-reserve disabled LUN reserves no space until data is written.
Storage Provisioning and Management
Question
You create a 150 GB thick-provisioned volume. In that volume, you create a 50 GB LUN with space-reserve enabled. You create another 50 GB LUN with space-reserve disabled. Before any data is written to either LUN or a Snapshot is taken, how much space will be available in the volume for additional LUNs?
Options
- A150 GB
- B100 GB
- C75 GB
- D50 GB
Explanation
A space-reserve enabled LUN on a thick-provisioned volume immediately allocates its full size, while a space-reserve disabled LUN reserves no space until data is written.
Common mistakes.
- A. 150 GB would only remain available if neither LUN reserved any space, but the space-reserve enabled LUN immediately claims its full 50 GB allocation upon creation.
- C. 75 GB is incorrect because the space-reserve disabled LUN does not consume any volume space before data is written or a snapshot is taken, so only 50 GB is consumed - not 75 GB.
- D. 50 GB would be the remaining space only if both LUNs reserved their full 50 GB upfront, but space-reserve disabled means no space is pre-allocated for that LUN.
Concept tested. ONTAP LUN space reservation on thick-provisioned volumes
Reference. https://docs.netapp.com/us-en/ontap/san-admin/space-reservation-concept.html
Topics
#space reservation#thick provisioning#LUN space#volume capacity
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