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How to run VAAI UNMAP and return capacity to Element

Last Updated:

Applies to

  • NetApp Element software
  • ESXi 5.5, 6.0 & 6.5
  • VMware Virtual Machine File System (VMFS)
  • VCP 4.x


  • UNMAP allows the ESXi host to inform the storage array that files or VMs have been moved or deleted from a Thin-Provisioned VMFS datastore
  • This allows Element software to correctly release unused blockspace and reclaim capacity 
  • UNMAP is beneficial to use when vCenter is reporting less used data than Element software is using



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