UIM - Monitor disk offline state / NTFS mount dismounted
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UIM - Monitor disk offline state / NTFS mount dismounted


Article ID: 270556


Updated On:


DX Unified Infrastructure Management (Nimsoft / UIM)


We need to monitor disk offline status for Windows servers but this option is not available in the CDM probe.

We are trying to get an alert whenever a non-OS disk on a Windows server goes offline:

How can we monitor when an NTFS volume is successfully dismounted?


  • Release: UIM 20.4
  • CDM, ntevl, any version


  • Guidance


  • When changing the disk status from offline to online the event is written in the Windows Event log.
  • Event ID 303 is generated in the Windows Event Log when the NTFS volume has successfully dismounted.
  • Technically this event indicates: "This event is logged when the user on client computer disconnected from the following network resource"
  • Using the ntevl probe it is possible to monitor this event and receive an alarm when this event occurs
  • NT Event Log (broadcom.com)