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    • volume efficiency undo command does not clear deduplicated blocks
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/volume_efficiency_undo_command_does_not_clear_deduplicated_blocks
      Applies to ONTAP 9 Storage Efficiency Issue volume efficiency undo command does not clear deduplicated blocks
    • SnapMirror  destination volume uses much more space than the source volume
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/SnapMirror__destination_volume_uses_much_more_space_than_the_source_volume
      Applies to SnapMirror DP/XDP convert AllFlashFAS (AFF) FlexCache Issue Used space of a SnapMirror destination volume differs from the source volume after DP to XDP convert No issues seen on Deduplicat...Applies to SnapMirror DP/XDP convert AllFlashFAS (AFF) FlexCache Issue Used space of a SnapMirror destination volume differs from the source volume after DP to XDP convert No issues seen on Deduplication or Storage Efficiency SnapMirror destination volume space usage greatly exceeded source volume
    • Wrong available space for volume in OnCommand System Manager
      https://kb.netapp.com/Legacy/OnCommand_Suite/Wrong_available_space_for_volume_in_OnCommand_System_Manager
      Applies to ONTAP 9 Storage Efficiency OnCommand System Manager (OCSM) Issue When displaying the volume details in OCSM, the last storage efficiency job executed shows the before value of saved data as...Applies to ONTAP 9 Storage Efficiency OnCommand System Manager (OCSM) Issue When displaying the volume details in OCSM, the last storage efficiency job executed shows the before value of saved data as 0.
    • Error disabling Storage Efficiency for a destination volume in SVMDR relationship
      https://kb.netapp.com/on-prem/ontap/DM/Efficiency/Efficiency-KBs/Error_disabling_Storage_Efficiency_for_a_destination_volume_in_SVMDR_relationship
      Applies to ONTAP 9 Vserver Disaster Recovery (SVMDR) Storage Efficiency Issue In certain circumstances, you might want to disable Storage Efficiency in a destination volume involved in a SVMDR relatio...Applies to ONTAP 9 Vserver Disaster Recovery (SVMDR) Storage Efficiency Issue In certain circumstances, you might want to disable Storage Efficiency in a destination volume involved in a SVMDR relationship. Attempting to disable storage efficiency will result in the following error: Error: This operation is not permitted on a Vserver that is configured as the destination for identity preserve Vserver DR.
    • Storage efficiency report missing in Active IQ Digital Advisor Capacity and Efficiency tab
      https://kb.netapp.com/data-mgmt/Digital-Advisor-KBs/Storage_efficiency_report_missing_in_Active_IQ_Digital_Advisor_Capacity_and_Efficiency_tab
      Applies to Active IQ Digital Advisor (AIQDA) Issue Storage efficiency report missing in Active IQ Digital Advisor Capacity and Efficiency tab ASUP option -remove-private-data is enabled on Clusters
    • Compression of existing data cannot proceed. Large amount of shared data can cause significant extra space usage
      https://kb.netapp.com/on-prem/ontap/DM/Efficiency/Efficiency-KBs/Compression_of_existing_data_cannot_proceed._Large_amount_of_shared_data_can_cause_significant_extra_space_usage
      Applies to ONTAP 9.x Storage Efficiency Issue Volume Efficiency command fails Example: Cluster::> volume efficiency start -vserver <Vserver> -volume <volume> -scan-old-data true -compression true -sna...Applies to ONTAP 9.x Storage Efficiency Issue Volume Efficiency command fails Example: Cluster::> volume efficiency start -vserver <Vserver> -volume <volume> -scan-old-data true -compression true -snapshot-blocks true -shared-blocks true -dedupe true -compaction true Error: command failed: Failed to start efficiency on volume "<Volume>" of Vserver "<Vserver>": Compression of existing data cannot proceed. Large amount of shared data can cause significant extra space usage.
    • Hung deduplication job - Cannot stop job due to "Another sis operation is currently active."
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Hung_deduplication_job_Cannot_stop_job_due_to_Another_sis_operation_is_currently_active
      Deduplication job is not progressing. Attempts to stop efficiency fails with the following command and error: cluster::> volume efficiency off -vserver <vserver> -volume <volume> Error: command failed...Deduplication job is not progressing. Attempts to stop efficiency fails with the following command and error: cluster::> volume efficiency off -vserver <vserver> -volume <volume> Error: command failed: Failed to disable efficiency on volume "volume" of Vserver "vserver": Another sis operation is currently active. Nodeshell does not allow SIS options: node> sis stop options: no such command "sis" There are no visible volume efficiency jobs with: cluster::> job show -node <node> -vserver <vserver>
    • What Inline Storage Efficiency features are supported with CVO?
      https://kb.netapp.com/Cloud/Cloud_Volumes_ONTAP/What_Inline_Storage_Efficiency_features_are_supported_with_CVO
      NetApp Cloud Volumes ONTAP 9.11.1x (CVO) Inline Storage Efficiency (ISE) Single Instance Data Logging (SIDL) Inline Inline (8K) CVO (SIDL on) VNVRAM enabled (High Write speed off & SIDL off) CVO (High...NetApp Cloud Volumes ONTAP 9.11.1x (CVO) Inline Storage Efficiency (ISE) Single Instance Data Logging (SIDL) Inline Inline (8K) CVO (SIDL on) VNVRAM enabled (High Write speed off & SIDL off) CVO (High Write Spead on) Inline dedupe or any other Storage Efficiency improvements are not allowed on Azure HA page blob. For managed disks on Cloud Volumes ONTAP in Azure, inline storage efficiency settings are replaced by the default settings of Temperature sensitive storage efficiency (TSSE).
    • Huge difference between source and destination snapshot size
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/Huge_difference_between_source_and_destination_snapshot_size
      Applies to ONTAP 9 Snapmirror Single Instance Storage (SIS) deduplication Issue Checking snapshot size on source and destination a huge difference in size can be noticed On destination snapshot size a...Applies to ONTAP 9 Snapmirror Single Instance Storage (SIS) deduplication Issue Checking snapshot size on source and destination a huge difference in size can be noticed On destination snapshot size a snapshot spill can be seen. Even though all stale snapshots on destination have been deleted and destination has the same snapshots with source , the difference is still huge.
    • How is space utilization managed in Data ONTAP SAN environment?
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/How_is_space_utilization_managed_in_a_Data_ONTAP_SAN_environment
      This article covers how to manage space utilization in Data ONTAP SAN environment. You can get information on storage efficiency, space guarantee,  space allocation in an aggregate, snapshot of a LUN,...This article covers how to manage space utilization in Data ONTAP SAN environment. You can get information on storage efficiency, space guarantee,  space allocation in an aggregate, snapshot of a LUN, LUN space reservation and snapshot copy reserve. It also cover the options if you are running out of space.
    • SnapMirror primary and mirrored volume differs in space utilization
      https://kb.netapp.com/on-prem/ontap/DP/SnapMirror/SnapMirror-KBs/SnapMirror_primary_and_mirrored_volume_differs_in_space_utilization
      Applies to ONTAP 9 SnapMirror XDP Issue Used size for each volume differs between the primary and mirrored volume. The space usage in the mirrored volumes are higher compared to the primary volumes or...Applies to ONTAP 9 SnapMirror XDP Issue Used size for each volume differs between the primary and mirrored volume. The space usage in the mirrored volumes are higher compared to the primary volumes or vise versa.