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Referenced objects left in cloud tier after promoting data

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ontap-9
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core
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Applies to

  • ONTAP 9
  • FabricPool

Issue

  • After setting cloud-retrieval-policy to promote and tiering-policy to none, a tiering scanner was triggered manually
  • The expectation was for all data to be removed from the cloud tier and promoted back to performance tier
  • volume show-footprint seemed to have confirmed no data from any volume is currently sitting in cloud tier anymore:

DATA_VOL_03
      Feature                                                  Used        Used%
      ---------------------------------------------      -------------    -----
      Volume Data Footprint                                   7.54TB        25%
      Footprint in Performance Tier                           7.73TB       102%
      Flexible Volume Metadata                                46.6GB         0%
      Deduplication Metadata                                  45.3GB         0%
      Deduplication                                           45.3GB         0%
      Delayed Frees                                           61.0GB         0%
 
  • aggregate show-space however did still show both referenced and unreferenced objects in cloud tier:
Aggregate: AGGR1
cloud_bucket_01

      Feature                                                  Used       Used%
      ---------------------------------------------      -------------    -----
      Logical Used                                            56.4MB       -
      Logical Referenced Capacity                             2.79MB       -
      Logical Unreferenced Capacity                           53.6MB       -
      Space Saved by Storage Efficiency                        148KB       -

      Total Physical Used                                     56.3MB       -
  • The assumption here would be that the amount of space occupied by the tiered blocks is lower than 1% of the volume size, so ONTAP doesn't report it at all in volume show-space

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