Disk (Local API, SNMP, WMI) service

The Disk service monitors a hard disk for its used, free, and total disk space. If a drive name is not found, the drive will appear misconfigured. For example, if you are monitoring a USB drive or similar removable drive that is removed.

Service Type Local API, SNMP, and WMI
Instances on a Device 15
Device Class for Disk (Local API) Server - Generic, Workstation - Generic, Laptop - Windows, Server - Windows, and Workstation - Windows
Device Class for Disk (SNMP) Server - Generic, Workstation - Generic, Other, Printer, Scanner/Camera, Switch/Router, Laptop - Windows, Server - Windows, and Workstation - Windows
Device Class for Disk (WMI) Laptop - Windows, Server - Windows, and Workstation - Windows
Monitored By Agent (Windows, Red Hat Enterprise Linux, and macOS 10.4 and higher) and Windows probe (SNMP and WMI)
Scan Interval 60 minutes
Minimum Scan Interval 1 minute
Drive Designation Letter The letter of the hard disk or partition to monitor. For example, C: or D:.
Volume Index (SNMP only) The index of the SNMP object representing the partition of hard disk to monitor.

Properties queried and calculations performed (WMI only)

Namespace root\cimv2
WMI Class Win32_LogicalDisk
WMI Property 0 Size
WMI Property 1 FreeSpace

To configure Volume Name or Volume Index, walk the .1.3.6.1.2.1.25.2.3.1.3 SNMP OID on the target device's IP address to determine which disks are available for monitoring.

.1.3.6.1.2.1.25.2.3.1.3.1 "A:\"

.1.3.6.1.2.1.25.2.3.1.3.2 "C:\ Label: Serial Number 74ebc3fb"

.1.3.6.1.2.1.25.2.3.1.3.3 "D:\ Label:SP2POEM_EN Serial Number 356563d9"

.1.3.6.1.2.1.25.2.3.1.3.4 "Virtual Memory"

OID/Calculation (SNMP only)

N-able N-central services use Reverse Polish Notation (RPN) for all calculation formulae.

Metric Name OID/Calculation Description
Total Disk Size (Total Disk Size x $hrStorageAllocationUnit) / 1024

The size of the disk.

 

 

Disk Space Used (Disk Space Used x $hrStorageAllocationUnit) / 1024

The amount of space used on the disk.

 

Disk Free Space [(Total Disk Size - Disk Space Used) x $hrStorageAllocationUnit] / 1024 The unoccupied space on the partition or disk.
Disk Usage (%) (Disk Space Used / Total Disk Size) x 100 The percentage of space used on the disk.