Disk Utilization (Performance) monitor provides disk capacity and utilization metrics. It is a core WhatsUp Gold performance monitor that cannot be removed from the Monitors Library. This monitor requires SNMP or Windows (WMI) credentials. If you collect from a VMware environment, you will need VMware credentials.
Note: If you want to return disk utilization metrics for a Hyper-V guest VM, you must enable the VM to record WMI or SNMP metrics as described in a community article titled Hyper-V Disk Utilization Information May Not Be Available. Outside of this requirement, Virtual Monitoring also provides read/write metrics in the Virtual Machines Disk Activity report. (The Virtual Machines Disk Activity monitor is a default monitor added to devices exhibiting the VM role).
Tip: This community article (Requirements for Remote WMI Access) details how to enable WMI on the device(s) you want to poll.