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    • E-Series: How does the Thin Volume feature works?
      https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/E-Series_How_does_the_Thin_Volume_feature_works
      When there are “enough” free clusters -which is dependent on the repository size- periodic defrag scans will shift the free clusters together into contiguous 4GB C-stripes that can be freed and return...When there are “enough” free clusters -which is dependent on the repository size- periodic defrag scans will shift the free clusters together into contiguous 4GB C-stripes that can be freed and returned to the pool (min of 4GB at a time, but this varies depending on the size of repository and UNMAP operation). When the scans reach their target based of the repository size, the number of blocks to be reclaimed, it will give the freed C-stripes back to the DDP.
    • What are Windows host operating system considerations when using SCSI UNMAP with E-Series thin volumes?
      https://kb.netapp.com/on-prem/E-Series/SANtricity-OS-KBs/What_are_Windows_host_operating_system_considerations_when_using_SCSI_UNMAP_with_E-Series_thin_volumes
      UNMAP is a SCSI command that can be issued to the storage array by a host system to reclaim space on a thin volume after disk blocks have been deleted by an application or OS. Note that thin provision...UNMAP is a SCSI command that can be issued to the storage array by a host system to reclaim space on a thin volume after disk blocks have been deleted by an application or OS. Note that thin provisioned volumes may have been created with earlier versions than 08.25.05, but they will not be reported to the host operating system as thin volumes.
    • LUN unexpectedly out of space
      https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/LUN_unexpectedly_out_of_space
      Thin LUN out of space and goes offline: Wed Nov 03 18:58:42 +0300 [NETAPP01: scsit_lu_0: scsiblade.lun.offline.system:error]: LUN 81EiL+Qh7xxx in volume with MSID 21606016xx on Vserver vserver1 has be...Thin LUN out of space and goes offline: Wed Nov 03 18:58:42 +0300 [NETAPP01: scsit_lu_0: scsiblade.lun.offline.system:error]: LUN 81EiL+Qh7xxx in volume with MSID 21606016xx on Vserver vserver1 has been brought offline due to lack of space in the volume. "2024-04-08T17:08:29-07:00","clusterabc","emergency" "LUN.out.of.space: LUN /vol/vol1/lun, vol vol1 (DSID 1051) is out of space (UUID: 16fe70a3-a17c-4861-9c55-dd5b864306xx)." LUN is offline with Space Reservation and Space Allocation disabled:
    • 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