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then the cluster is the issue in this case. PRTG uses the 'DeviceID' to monitor the drives, and this one changes if the cluster switches nodes. A work-around would be to use the Single-Disk WMI Sensors. They have an option to not use the DeviceID, and instead use the drive-letter, which shouldn't change in the cluster.
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
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