I have a very strange situation. I have a Windows 2012 R2 VM with mounted thin provisioned LUNs located on a NetApp FAS2552 filer (running cDOT 9.4P2), and the server is not sending SCSI UNMAP commands when files are deleted from the LUNs.
Things I have tried:
- C:\Windows\system32>fsutil behavior query disabledeletenotify (returns 0)
- Restarted the client OS
- dismounted and remounted the LUN
I have verified that there are no UNMAP commands being received by the toaster by doing a statistics run on the LUN while deleting files, and looking at the counters as suggested here: https://kb.netapp.com/app/answers/answer_view/a_id/1002617/~/faq---windows-scsi-unmap-
I opened a case with NetApp, and they are claiming that, because the host is not sending unmap commands, it is an issue that I need to take up with Microsoft.
So I came here first... anyone have any idea how to figure out why this host is not sending unmap commands when files are deleted?
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