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    • ONTAP namespace space reclamation on NVMe datastore does not work
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/ONTAP_namespace_space_reclamation_on_NVMe_datastore_does_not_work
      Applies to ONTAP 9 NVMe namespace VMware ESXi 8.0 u2 and later Issue NVMe namespace does not free space in aggregate after it is deleted by host When using NVMe/FC or NVMe/TCP deleting space in VMware...Applies to ONTAP 9 NVMe namespace VMware ESXi 8.0 u2 and later Issue NVMe namespace does not free space in aggregate after it is deleted by host When using NVMe/FC or NVMe/TCP deleting space in VMware ESXi 8 update 3 datastore does not free up space in the ONTAP volume
    • How to determine optimal unmap granularity
      https://kb.netapp.com/Legacy/ONTAP/7Mode/How_to_determine_optimal_unmap_granularity
      Applies to Data ONTAP operating in 7-Mode ONTAP 9 VMware ESXi VMware vCenter Server VMware Virtual Machine File System (VMFS) version 6 Description According to VMware's documentation Space Reclamatio...Applies to Data ONTAP operating in 7-Mode ONTAP 9 VMware ESXi VMware vCenter Server VMware Virtual Machine File System (VMFS) version 6 Description According to VMware's documentation Space Reclamation Requests from VMFS Datastores when setting up automatic space reclamation for VMFS6 datastores you need to specify the unmap granularity based on the storage vendor's optimal unmap granularity
    • VMware shows inaccurate space compared to storage when using thin provisioning
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/ONTAP__thin_volume_VMware_Datastore_shows_more_space_used_than_expected
      Deleting files or VMs on VMware does not return space to the LUN or volume, and the space shows as full. Sun Jul 21 05:31:59 +0800 [NetApp-01: VdomFSMThr_06: LUN.out.of.space:EMERGENCY]: LUN /vol/vol1...Deleting files or VMs on VMware does not return space to the LUN or volume, and the space shows as full. Sun Jul 21 05:31:59 +0800 [NetApp-01: VdomFSMThr_06: LUN.out.of.space:EMERGENCY]: LUN /vol/vol1/lun1, vol vol1 (DSID 10xx) is out of space (UUID: f53f44f5-b2b2-4b7d-9d8e-595e128xxxx). Sun Jul 21 05:49:43 +0800 [NetApp-01: wafl_exempt01: wafl.spacemgmnt.policyChg:notice]: The space management policy for volume volnetapp has changed: autosize volume maximum size 322122547200KB.
    • Deleting data from NTFS does not free up space
      https://kb.netapp.com/data-mgmt/OTV/VSC_Kbs/Deleting_data_from_NTFS_does_not_free_up_space
      Applies to NTFS VMware ONTAP Issue Deleting data from NTFS located on NFS datastore does not reclaim expected space
    • Slow Wafl Scanner cause delay in freeing blocks from snapshots
      https://kb.netapp.com/on-prem/ontap/Perf/Perf-KBs/Slow_Wafl_Scanner_cause_delay_in_freeing_blocks_from_snapshots
      Applies to ONTAP 9 Issue Snapshot deletions take a long time to free blocks on the volume
    • Space reclamation on the filer is slow
      https://kb.netapp.com/on-prem/ontap/OHW/OHW-KBs/Space_reclamation_on_the_filer_is_slow
      Applies to ONTAP VEEAM Microsoft Issue After Veeam backup deletions or consolidation space on a thin volume is not returned until several minutes after deletion
    • Deleted snapshots rolling over to older snapshots
      https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Deleted_snapshots_rolling_over_to_older_snapshots
      Applies to ONTAP 8 ONTAP 9 Issue User attempts to delete a Snapshot that is large in size, the "size" of the Snapshot will roll over into the previous Snapshot increasing its size again.