How to verify NetWall Diode SNMP OID Units & GUI

Overview

This article documents the units returned by NetWall Diode SNMP OIDs for RAM and Disk monitoring, and how to verify these values using the NetWall web GUI.

All OID values have been validated against a live NetWall Diode and match the GUI exactly.

OID Unit Reference

RAM OIDs

OID	OID Path	Unit	Source
`meminfo-memtotal`	.1.3.6.1.4.1.61422.500.50	kB (kilobytes)	`/proc/meminfo` → MemTotal
`meminfo-memfree`	.1.3.6.1.4.1.61422.500.51	kB (kilobytes)	`/proc/meminfo` → MemFree
`meminfo-buffers`	.1.3.6.1.4.1.61422.500.52	kB (kilobytes)	`/proc/meminfo` → Buffers
`meminfo-cached`	.1.3.6.1.4.1.61422.500.53	kB (kilobytes)	`/proc/meminfo` → Cached
`meminfo-basispointsused`	.1.3.6.1.4.1.61422.500.54	Basis points (÷100 = %)	Calculated

Disk OIDs

OID	OID Path	Unit	Source

OID	OID Path	Unit	Source
`fs-persist-blocks`	.1.3.6.1.4.1.61422.500.60.1	1K-blocks	Persistent partition
`fs-persist-pct`	.1.3.6.1.4.1.61422.500.60.4	Percentage (0–100)	Persistent partition usage
`fs-tmp-blocks`	.1.3.6.1.4.1.61422.500.60.9	1K-blocks	/tmp (tmpfs) partition
`fs-tmp-pct`	.1.3.6.1.4.1.61422.500.60.12	Percentage (0–100)	/tmp partition usage

Important note on -pct OIDs: The MIB DESCRIPTION states these are "expressed in basis points (percentage times 100)", however testing has confirmed that the device returns plain percentage (0–100), not basis points (0–10000). For example, 54% disk usage returns 54, not 5400.

MIB Definitions (from OPSWAT-NETWALL-BLUE-MIB v1.11)

meminfo-memtotal OBJECT-TYPE SYNTAX INTEGER MAX-ACCESS read-only STATUS current DESCRIPTION "total memory on-device" ::= { netwall-blue 50 } meminfo-memfree OBJECT-TYPE SYNTAX INTEGER MAX-ACCESS read-only STATUS current DESCRIPTION "memory free on-device" ::= { netwall-blue 51 } meminfo-buffers OBJECT-TYPE SYNTAX INTEGER MAX-ACCESS read-only STATUS current DESCRIPTION "memory buffers on-device" ::= { netwall-blue 52 } meminfo-cached OBJECT-TYPE SYNTAX INTEGER MAX-ACCESS read-only STATUS current DESCRIPTION "memory allocated to cache on-device" ::= { netwall-blue 53 } meminfo-basispointsused OBJECT-TYPE SYNTAX INTEGER MAX-ACCESS read-only STATUS current DESCRIPTION "memory usage in basis points" ::= { netwall-blue 54 }

Disk Section

fs-persist-blocks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of persist-file-system blocks on the system." ::= { system-resources 1 } fs-persist-pct OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of usable persist-file-system blocks on the system, expressed in basis points (percentage times 100)." ::= { system-resources 4 } fs-tmp-blocks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of working-file-system blocks on the system." ::= { system-resources 9 } fs-tmp-pct OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of usable working-file-system blocks on the system, expressed in basis points (percentage times 100)." ::= { system-resources 12 }

GUI Verification

To compare SNMP values against actual system performance, navigate to the NetWall web console:

1. Disk Usage — `Advanced > Statistics > File System Usage`

Filesystem	Mount	1K-blocks	Used	Available	Use%
`/dev/nvme0n1p2`	`/run/live/persistence/nvme0n1p2`	1,898,640	1,018,912	869,728	54%
`tmpfs`	`/tmp`	2,097,152	893,232	1,203,920	43%

Expected SNMP values:

fs-persist-blocks → 1898640
fs-persist-pct → 54
fs-tmp-blocks → 2097152
fs-tmp-pct → 43

To convert...	Do this
kB → GB	Divide by 1,048,576
1K-blocks → GB	Divide by 1,048,576
Basis points → percentage (meminfo only)	Divide by 100

Known Discrepancy

Item	MIB Documentation Says	Actual Device Behavior
`fs-persist-pct`	Basis points (0–10000)	Plain percentage (0–100)
`fs-tmp-pct`	Basis points (0–10000)	Plain percentage (0–100)

This has been confirmed by customer testing (July 2026, Diode OD-102).

If Further Assistance is required, please proceed to log a support case or chat with one of our support engineers.

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