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Space is not reclaimed on LUN with ESXi vRDM

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Category:
ontap-9
Specialty:
san
Last Updated:

Applies to

  • ONTAP 9
  • SAN
  • VMware ESXi
  • RDM in virtual compatibility (vRDM)
  • Windows Server 2022

Issue

  • Windows Server guest OS on VMware ESXi with iSCSI LUNs connected with vRDM
  • ONTAP LUN has space-allocation enabled but deleting files in Windows has no effect on used space shown in ONTAP
  • Windows has delete notifications enabled:
fsutil behavior query DisableDeleteNotify
NTFS DisableDeleteNotify = 0  (Allows TRIM operations to be sent to the storage device)
ReFS DisableDeleteNotify = 0  (Allows TRIM operations to be sent to the storage device)
  • ONTAP does not receive unmap_reqs:
statistics show -sample-id lun_12
 
Object: lun
Instance: /vol/vol_12/lun_12
Start-time: 8/22/2024 14:39:49
End-time: 8/23/2024 11:04:07
Elapsed-time: 73458s
Scope: iscsi_01
Number of Constituents: 2 (complete_aggregation)
Counter                                                     Value
-------------------------------- --------------------------------
unmap_error_to_good_count                                       0
unmap_reqs                                                      0
unmap_too_big_error_count                                       0
unmap_too_many_error_count                                      0
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