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    • How does the deduplication changelog work?
      https://kb.netapp.com/on-prem/ontap/DM/Efficiency/Efficiency-KBs/How_does_the_deduplication_changelog_work
      Once deduplication is started, Data ONTAP refers to the changelog to deduplicate the data, and clears the changelog when the deduplication process is complete. When it is about to exceed this limit, D...Once deduplication is started, Data ONTAP refers to the changelog to deduplicate the data, and clears the changelog when the deduplication process is complete. When it is about to exceed this limit, Data ONTAP stops writing modifications to the changelog and writes the following message to the syslog: To start the deduplication process and clear the changelog, use the appropriate command: The sis start command starts the deduplication process and clears the changelog.
    • Scheduled deduplication job stops at saving_sharing phase
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Scheduled_deduplication_stops_at_saving_sharing_phase
      Fri Nov 27 00:00:00 2020 [Vserver UUID: de5d877b-eb36-xxxx-xxxx-xxxxxxxx] /vol/vol1 [sid: 0] Info (sis start schedule) Sat Nov 28 00:00:00 2020 [Vserver UUID: de5d877b-eb36- xxxx-xxxx-xxxxxxxx] /vol/v...Fri Nov 27 00:00:00 2020 [Vserver UUID: de5d877b-eb36-xxxx-xxxx-xxxxxxxx] /vol/vol1 [sid: 0] Info (sis start schedule) Sat Nov 28 00:00:00 2020 [Vserver UUID: de5d877b-eb36- xxxx-xxxx-xxxxxxxx] /vol/vol1 [sid: 0] Info (sis start schedule) Sun Nov 29 00:00:00 2020 [Vserver UUID: de5d877b-eb36- xxxx-xxxx-xxxxxxxx] /vol/vol1 [sid: 0] Info (sis start schedule) Mon Nov 30 00:00:00 2020 [Vserver UUID: de5d877b-eb36- xxxx-xxxx-xxxxxxxx] /vol/vol1 [sid: 0] Info (sis start schedule)
    • How to undo the storage efficiency savings in ONTAP
      https://kb.netapp.com/on-prem/ontap/DM/Efficiency/Efficiency-KBs/How_to_undo_the_storage_efficiency_savings_in_ONTAP
      Applies to ONTAP Storage Efficiency Compression Compaction Description Beginning ONTAP release 9.2, storage efficiency is enabled by default on All Flash FAS (AFF) platforms. Under certain conditions ...Applies to ONTAP Storage Efficiency Compression Compaction Description Beginning ONTAP release 9.2, storage efficiency is enabled by default on All Flash FAS (AFF) platforms. Under certain conditions it may become necessary to undo the SE savings: Converting a thin provisioned volume to thick and hosting a LUN, since AFF by default creates thin provisioned volumes Changing the SE compression type Changing the application io size to improve the compression savings
    • Enabling deduplication fails with Operation is not configured error following 7MTT migration
      https://kb.netapp.com/Legacy/ONTAP/7Mode/Enabling_deduplication_fails_with_Operation_is_not_configured_error_following_7MTT_migration
      Enabling volume efficiency or running any volume efficiency operation fails with an Operation is not configured error: cluster01::> volume offline -volume vol1 -vserver svm1 cluster01::> volume online...Enabling volume efficiency or running any volume efficiency operation fails with an Operation is not configured error: cluster01::> volume offline -volume vol1 -vserver svm1 cluster01::> volume online -volume vol1 -vserver svm1 cluster01::> volume efficiency on -vserver svm1 -volume vol1 Error: command failed: Failed to enable efficiency on volume "vol1" of Vserver "svm1": Operation The volume move hangs at 98% and reports a Deduplication operation is not configured error.
    • 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.