Palo Alto Networks Knowledgebase: SNMP Poll Reports Different Memory Usage than show system resources""

SNMP Poll Reports Different Memory Usage than show system resources""

6503
Created On 02/07/19 23:47 PM - Last Updated 02/07/19 23:47 PM
Resolution

Symptom

The value reported by snmp poll for hrStorage (hrStorageRAM) shows very different value than memory use reported by the show system resource command.

Values from SNMP poll:

HOST-RESOURCES-MIB::hrStorageIndex.1020 = INTEGER: 1020

HOST-RESOURCES-MIB::hrStorageType.1020 = OID: HOST-RESOURCES-TYPES::hrStorageRam

HOST-RESOURCES-MIB::hrStorageDescr.1020 = STRING: Slot-1 Management Memory

HOST-RESOURCES-MIB::hrStorageAllocationUnits.1020 = INTEGER: 1024 Bytes

HOST-RESOURCES-MIB::hrStorageSize.1020 = INTEGER: 4057060

HOST-RESOURCES-MIB::hrStorageUsed.1020 = INTEGER: 866824

Values from show system resources:

> show system resources

top - 15:26:01 up 19 days,  3:16,  3 users,  load average: 0.40, 0.45, 0.21

Tasks: 111 total,   1 running, 110 sleeping,   0 stopped,   0 zombie

Cpu(s):  4.2%us, 11.4%sy,  0.6%ni, 83.3%id,  0.0%wa,  0.0%hi,  0.5%si,  0.0%st

Mem:   4057060k total,  3894776k used,   162284k free,  279116k buffers

Swap:  2008084k total,        0k used,  2008084k free,  2748044k cached

Cause

The value reported via SNMP takes into account that Linux-based systems use buffers and cache in memory to speed up disk operations. These buffers are freed when memory needs to be used/allocated. Once this is taken into account then 3894776-(279116+2748044) = 867616, which is very close to the value received from the SNMP poll.

owner: rweglarz



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