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Volume Efficiency (deduplication) not completing for auto efficiency policy when changelog usage is over 20 percent

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Category:
ontap-9
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Applies to

  • ONTAP
  • Volume with efficiency policy set to auto
  • Deduplication changelog over the default threshold of 20%

Issue

  • Volume efficiency (deduplication) operations run but do not complete for volumes with the auto efficiency policy and changelog usage over the default threshold of 20%.
  • Automatic deduplication should run once changelog is over 20% full.
  • A volume efficiency show command gives output similar to the following:

Cluster01::> volume efficiency show -vserver svm1 -volume vol1 -instance

                                     Vserver Name: svm1
                                      Volume Name: vol1
                                      Volume Path: /vol/vol1
                                            State: Enabled
                                           Status: Active
                                         Progress: Fingerprint is being recovered from aggregate (0% complete)
                                             Type: Regular
                                         Schedule: -
                           Efficiency Policy Name: auto
                           Efficiency Policy UUID: ffffffff-ffff-ffff-ffff-ffffffffffff
                             Last Operation State: Success
                     Last Success Operation Begin: Tue May 30 22:58:25 2017
                       Last Success Operation End: Tue May 30 22:58:25 2017
                             Last Operation Begin: Wed Mar 18 15:15:16 2020
                               Last Operation End: Wed Mar 18 15:20:00 2020
                              Last Operation Size: 0B
                             Last Operation Error: -
                              Operation Frequency: Once approxmiately every 5 min(s) and 18 sec(s)
                                  Changelog Usage: 91%
                                   Changelog Size: 314.9GB
 

  • Notice no errors are being reported, the changelog usage is 91% and that the operation is being executed very frequently, but doing nothing.

 

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