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vSphere client shows lower than expected used capacity for Thick-Provisioned VMDK on NetApp NFS datastore

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ontap-9
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virt
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Applies to

  • NetApp ONTAP 9
  • VMware vSphere 7.0u3
  • NetApp NFS Plug-in for VMware VAAI 2.0

Issue

  • In the vSphere client datastore view, discrepancies in the “Used capacity” for certain virtual machines.
  • The disks of the three virtual machines are thick provisioned (Lazy Zeroed).
  • The usage shown in File Explorer is roughly the same (147 GB).
  • However, when looking at the datastore in vSphere client, the Used capacity appears as shown only XXX14 is displayed with an unusually small value.
  • vSphere Client display
XXX14: 128.71GB used
XXX13: 352.74GB used
XXX15: 352.32GB used
  • Physical usage with du in the ONTAP node shell (for each VM individually), that the XXX14-flat.vmdk file itself is smaller than the other two.
XXX13-flat.vmdk：377004328
XXX15-flat.vmdk：374874164
XXX14-flat.vmdk：135915844

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