FORTINET-300-MIB :: fnSysDiskUsage

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsFORTINET-300-MIBfnSysDiskUsage

fnSysDiskUsage

Module: FORTINET-300-MIB

OID (symbolic): FORTINET-300-MIB::fnSysDiskUsage

OID (numeric): 1.3.6.1.4.1.12356.1.12

Node type: OBJECT-TYPE

Type: Gauge32

Access: read-only

Description: Current hard disk usage (MB)

What is fnSysDiskUsage?

Reports how much of the local hard disk, in megabytes, is currently in use, typically by logs. An admin alerts on this rising close to fnSysDiskCapacity to avoid the device silently dropping log records once the disk fills.

Examples

Walk all instances (SNMPv2c):

snmpwalk -v2c -c public <target> 1.3.6.1.4.1.12356.1.12
snmpwalk -v2c -c public <target> FORTINET-300-MIB::fnSysDiskUsage

Get a specific instance (index 1):

snmpget -v2c -c public <target> 1.3.6.1.4.1.12356.1.12.1
snmpget -v2c -c public <target> FORTINET-300-MIB::fnSysDiskUsage.1

Start monitoring Fortinet FortiGate firewall/UTM appliance (legacy FortiOS 3.00) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the FORTINET-300-MIB::fnSysDiskUsage OID value, configure state conditions and alerts, and monitor any Fortinet FortiGate firewall/UTM appliance (legacy FortiOS 3.00) from a single console.

OID Breakdown

Upper-level ancestors (6 from the standard OID tree / other modules)
Numeric OIDNameModule
1isoLANART-AGENT
1.3orgAirPair-MIB
1.3.6dodAirPair-MIB
1.3.6.1internetAirPair-MIB
1.3.6.1.4privateAirPair-MIB
1.3.6.1.4.1enterprisesAirPair-MIB
Numeric OIDNameModule
1.3.6.1.4.1.12356fortinetFORTINET-300-MIB
1.3.6.1.4.1.12356.1fnSystemFORTINET-300-MIB
1.3.6.1.4.1.12356.1.12fnSysDiskUsageFORTINET-300-MIB