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Why cross volume deduplication scan progress shows Progress: xx KB done larger than the aggregate physical capacity?

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ontap-9
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Applies to

  • ONTAP 9
  • ONTAP Storage Efficiency

Answer

  • Progress: xx KB Done represents the total sum of data blocks scanned on all volumes in the aggregate.
  • The target volume's data blocks refer to the volume's logical capacity, hence it is expected to exceed the aggregate physical total capacity. 

Example:

::> storage aggregate efficiency cross-volume-dedupe show -aggregate aggr1
 
                             Aggregate: aggr1
                                  Node: Node01
                              Progress: 323814930468 KB Done
                      Operation Status: Active
                  Last Operation State: Success
     Last Success Operation Begin Time: -
       Last Success Operation End Time: -
             Last Operation Begin Time: -
               Last Operation End Time: -
                  Last Operation Error: -
                                 Stage: DENSE_CVOL_GATHER_STAGE_DUP_SHARING
                       Checkpoint Time: Mon Apr 21 11:07:17 2025
             Checkpoint Operation Type: Scan
                      Checkpoint Stage: Sharing
 
::> storage aggregate show -aggregate aggr1 -fields size,used,availsize,percent-used
aggregate           availsize percent-used size    usedsize
------------------- --------- ------------ ------- --------
aggr1               66.40TB   76%          278.6TB 212.2TB

Additional Information

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