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Why the aggregate space is bigger than simulation size ?

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ontap-9
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Applies to

  • ONTAP 9.12.1 or later versions.
  • All Flash PAS (AFF)

Answer

It is a expected behavior.
Beginning in ONTAP 9.12.1 and later, 5% WAFL reserve is only supported for All Flash FAS (AFF), FSx, and the FAS500f platforms.
While you estimate the aggregate space via "aggregate create -simulate true", it still uses 10% WAFL reserve rather than 5%.
This is the reason why aggregate space is bigger than simulation size.

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