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NetApp LUN shows more used space than Windows Server volume

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Category:
ontap-9
Specialty:
san
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Applies to

  • ONTAP 9
  • SAN
  • Windows Server 2012 R2
  • Cluster Shared Volumes (CSV)
  • SCSI UNMAP

Issue

  • LUN shows more used space on NetApp side (e.g. from ONTAP System Manager or CLI) than corresponding volume mounted on Windows server
  • Space allocation is enabled:
cluster1::> lun show -fields space-allocation -path /vol/win1/win1
vserver     path           space-allocation
----------- -------------- ----------------
svm_windows /vol/win1/win1 enabled

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