N-central Troubleshooting

Disk Service (Local API, SNMP, WMI)

Last Modified

Fri Mar 16 13:39 GMT 2018

The Disk service monitors a hard disk for its used, free, and total disk space.

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 Windows Probe (SNMP and WMI)
Scan Interval	60 minutes
Drive Designation Letter	The designation 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.

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"

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.