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How to process the unreferenced space in FabricPool

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Applies to

  • ONTAP 9.8+
  • FabricPool 
  • On-prem and CVO

Description

In a FabricPool configuration, unreferenced space is the amount of space that is not referenced by ONTAP but still consumed in the cloud tier

Aggregate : aggr1
Performance Tier
      Feature                                           Used      Used%
      --------------------------------      ----------------      -----
      Volume Footprints                               30.5TB        54%
      Aggregate Metadata                               699GB         1%
      Total Used                                      31.1TB        55%

      Total Physical Used                             28.5TB        50%


Aggregate : aggr1
S3Bucket
      Feature                                           Used      Used%
      --------------------------------      ----------------      -----
      Logical Used                                     621TB       -
      Referenced Capacity                              421TB       -
      Logical Unreferenced Capacity                    199TB       -
      Space Saved by Storage Efficiency               26.6TB       -

      Total Physical Used                              594TB       -

  • There are two sources of unreclaimed space:
    1. Objects with zero ref count that garbage cleaner (GC) has not yet freed
    2. Fragmented objects that either haven't met the defrag threshold or that have met the defrag threshold but the tiering scan has not yet processed

** Note: The terminology Unreclaimed and Unreferenced are used interchangeably and means the same. 

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