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What's a MIB?

A MIB (Management Information Base) is a structured document that defines the data a device exposes over SNMP — things like interface counters, system uptime, or CPU load. Each module declares a set of named objects, organized into a tree.

What's SNMP?

SNMP (Simple Network Management Protocol) is how network devices — routers, switches, servers — report status and statistics to monitoring tools. It's the protocol; MIBs are the vocabulary it uses to describe what's being asked for.

What's an OID?

An OID (Object Identifier) is the numeric address of one piece of data in a MIB — a dotted sequence like 1.3.6.1.2.1.1.1, read from the root of a global tree down to one specific object. Names are easier to read; OIDs are what's actually sent over the wire.

Try it: sysDescr (1.3.6.1.2.1.1.1) →

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iso/org/dod/internet/private/enterprises/.674/.10893/.1/.1/.140/volumeTable/volumeEntry/volumeState

volumeState

OBJECT-TYPE

1.3.6.1.4.1.674.10893.1.1.140.7.1.3

Access

read-only

Status

mandatory

Source

ArrayManager-MIB

Sub-identifiers

Description

The volume's current state. Possible states: 0: Unknown 1: Ready - The volume is accessible and has no known problems. 2: Failed - The volume cannot be started automatically. 3: Online 4: Offline 6: Degraded 18: Failed Redundancy - The data on the volume is no longer fault tolerant because one of the underlying disks is not online. 25: No Media 26: Formatting - The volume is being formatted using the specifications you chose for formatting. ?: Initializing - The volume is being initialized. ?: Resynching - The volume's mirrors are being resynchronized so that both mirrors contain identical data. ?: Regenerating - Data and parity are being regenerated for the RAID-5 volume. ?: Failed Redundancy (At Risk) - The data on the volume is no longer fault tolerant, and I/O errors have been detected on the underlying disk ?: No Media - No media has been inserted into the CD-ROM or removable drive.

Syntax

INTEGER { ready(1), failed(2), online(3), offline(4), degraded(6), failedRedundancy(18), noMedia(25), formatting(26) }