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Why is my aggregate showing 10% less total space than expected?

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Applies to

ONTAP 9

Answer

  • The WAFL file system automatically reserves 10% of the aggregate space for metadata and performance.
    • Beginning in ONTAP 9.12.1, the WAFL reserve for aggregates greater than 30TB is reduced to 5% for All Flash FAS (AFF) and the FAS500f platforms. 
    • Beginning in ONTAP 9.14.1, this same reduction applies to aggregates on all FAS platforms, resulting in 5% more usable space in the aggregates.
  • The space used for maintaining the volumes in the aggregate comes out of the WAFL reserve and the WAFL reserve cannot be changed.

Additional Information

 

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