NS0-158 · Question #98
You have an aggregate with 10 TB free. You create a 1 TB volume with space-guarantee set to none. In that volume, you create a 500 GB LUN with space-reserve enabled. How much space is available in…
The correct answer is B. 9.5 TB. This question tests understanding of space allocation with different space-guarantee and space-reserve settings in NetApp ONTAP. The aggregate space available decreases by the size of the LUN if it has space-reserve enabled, even if the volume's space-guarantee is 'none'.
Question
You have an aggregate with 10 TB free. You create a 1 TB volume with space-guarantee set to none. In that volume, you create a 500 GB LUN with space-reserve enabled. How much space is available in the aggregate before data is written to the LUN?
Options
- A10 TB
- B9.5 TB
- C8.5 TB
- D9 TB
How the community answered
(38 responses)- A13% (5)
- B79% (30)
- C3% (1)
- D5% (2)
Why each option
This question tests understanding of space allocation with different space-guarantee and space-reserve settings in NetApp ONTAP. The aggregate space available decreases by the size of the LUN if it has space-reserve enabled, even if the volume's space-guarantee is 'none'.
The 500 GB LUN with space-reserve enabled immediately consumes space from the aggregate, so 10 TB is incorrect.
When a LUN has space-reserve enabled, its entire size is immediately reserved from the underlying aggregate, regardless of the parent volume's space-guarantee setting. Since a 500 GB LUN with space-reserve is created, 500 GB (0.5 TB) is consumed from the 10 TB free aggregate space. Therefore, 10 TB - 0.5 TB = 9.5 TB remains available in the aggregate.
This would imply that both the LUN and some additional volume space were reserved, which is not the case for a volume with space-guarantee 'none'.
This would imply 1 TB was reserved, which only happens if the volume itself had space-guarantee 'volume' or 'file', or if the LUN was 1 TB.
Concept tested: NetApp ONTAP space reservation LUN and volume
Source: https://docs.netapp.com/us-en/ontap/volumes/space-management-concept.html
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