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Home > Success Center > Network Performance Monitor (NPM) > Disk/volume/RAM/memory calculation

Disk/volume/RAM/memory calculation

Created by Malik Haider, last modified by Malik Haider on Aug 03, 2016

Views: 190 Votes: 3 Revisions: 12

Overview

In this article describes how Orion NPM calculates Disk/RAM/Memory/Volume from the device.

Environment

NPM 11.0 and later

Detail

First, you need to know what object IDs (OIDS) does Orion NPM poll for volume information including their types.

How does Orion calculate Linux O/S based system memory

See the following screenshot for an example from a system running Linux O/S:

disknew.jpg

 

You can Run Orion SNMPWALK  for the node in question in order to find out what values been returned by the Node for required OIDs as below.

.1.3.6.1.2.1.25.2.3.1.3.1 = String: "Physical RAM" .1.3.6.1.2.1.25.2.3.1.4.1 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.1 = INTEGER: 1021591 .1.3.6.1.2.1.25.2.3.1.6.1 = INTEGER: 447260
.1.3.6.1.2.1.25.2.3.1.3.2 = String: "Virtual Memory" .1.3.6.1.2.1.25.2.3.1.4.2 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.2 = INTEGER: 512034 .1.3.6.1.2.1.25.2.3.1.6.2 = INTEGER: 52
.1.3.6.1.2.1.25.2.3.1.3.3 = String: "/" .1.3.6.1.2.1.25.2.3.1.4.3 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.3 = INTEGER: 4232703 .1.3.6.1.2.1.25.2.3.1.6.3 = INTEGER: 2837178
.1.3.6.1.2.1.25.2.3.1.3.4 = String: "/proc" .1.3.6.1.2.1.25.2.3.1.4.4 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.4 = INTEGER: 0 .1.3.6.1.2.1.25.2.3.1.6.4 = INTEGER: 0
.1.3.6.1.2.1.25.2.3.1.3.5 = String: "/dev/pts" .1.3.6.1.2.1.25.2.3.1.4.5 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.5 = INTEGER: 0 .1.3.6.1.2.1.25.2.3.1.6.5 = INTEGER: 0
.1.3.6.1.2.1.25.2.3.1.3.6 = String: "/proc/bus/usb" .1.3.6.1.2.1.25.2.3.1.4.6 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.6 = INTEGER: 0 .1.3.6.1.2.1.25.2.3.1.6.6 = INTEGER: 0
.1.3.6.1.2.1.25.2.3.1.3.7 = String: "/partB" .1.3.6.1.2.1.25.2.3.1.4.7 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.7 = INTEGER: 4232699 .1.3.6.1.2.1.25.2.3.1.6.7 = INTEGER: 2736606
.1.3.6.1.2.1.25.2.3.1.3.8 = String: "/common" .1.3.6.1.2.1.25.2.3.1.4.8 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.8 = INTEGER: 17502476 .1.3.6.1.2.1.25.2.3.1.6.8 = INTEGER: 7646375
.1.3.6.1.2.1.25.2.3.1.3.9 = String: "/grub" .1.3.6.1.2.1.25.2.3.1.4.9 = INTEGER: 1024 .1.3.6.1.2.1.25.2.3.1.5.9 = INTEGER: 252879 .1.3.6.1.2.1.25.2.3.1.6.9 = INTEGER: 4303
.1.3.6.1.2.1.25.2.3.1.3.10 = String: "/dev/shm" .1.3.6.1.2.1.25.2.3.1.4.10 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.10 = INTEGER: 510795 .1.3.6.1.2.1.25.2.3.1.6.10 = INTEGER: 5422
.1.3.6.1.2.1.25.2.3.1.3.11 = String: "/spare" .1.3.6.1.2.1.25.2.3.1.4.11 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.11 = INTEGER: 8468466 .1.3.6.1.2.1.25.2.3.1.6.11 = INTEGER: 8256
.1.3.6.1.2.1.25.2.3.1.3.12 = String: "/proc/sys/fs/binfmt_misc" .1.3.6.1.2.1.25.2.3.1.4.12 = INTEGER: 4096 .1.3.6.1.2.1.25.2.3.1.5.12 = INTEGER: 0  

 

Calculation 

****************** Physical Disks ******************

hrStorageDescr = .1.3.6.1.2.1.25.2.3.1.3.3 = String: "/"

hrStorageAllocationUnits=   .1.3.6.1.2.1.25.2.3.1.4.3 = INTEGER: 4096

hrStorageSize .1.3.6.1.2.1.25.2.3.1.5.3 = INTEGER: 4232703

hrStorageUsed = .1.3.6.1.2.1.25.2.3.1.6.3 = INTEGER: 2837178

 

Calculations :

Volume size       4232703 x 4096  17337151488 Bytes   16.146 GB

Volume used       2837178 x 4096  11621081088 Bytes   10.822 GB

space available   17337151488 - 11621081088 = 5716070400 5.323 GB .

 

Percentage        10.8/16.14 * 100 65%

 

****************************************************

hrStorageDescr = .1.3.6.1.2.1.25.2.3.1.3.1 = String: "Physical RAM"

hrStorageAllocationUnits= .1.3.6.1.2.1.25.2.3.1.4.1 = INTEGER: 4096

hrStorageSize    .1.3.6.1.2.1.25.2.3.1.5.1 = INTEGER: 1021591

hrStorageUsed = .1.3.6.1.2.1.25.2.3.1.6.1 = INTEGER: 447260

 

Calculations : Physical RAM

 

Volume size       1021591 x 4096  4184436736 Bytes       3.897 GB

Volume used       447260 x 4096   1831976960 Bytes       1.706 GB

space available   1831976960 - 4184436736 = 2352459776     2.1 GB

 

Percentage        1.706/3.897 * 100 43%

 

*********************************************************

hrStorageDescr = .1.3.6.1.2.1.25.2.3.1.3.2 = String: "Virtual Memory"

hrStorageAllocationUnits= .1.3.6.1.2.1.25.2.3.1.4.2 = INTEGER: 4096

hrStorageSize    .1.3.6.1.2.1.25.2.3.1.5.2 = INTEGER: 512034

hrStorageUsed = .1.3.6.1.2.1.25.2.3.1.6.2 = INTEGER: 52

 

Calculations : Virtual Memory

 

Volume size       512034 x 4096  2097291264 Bytes   1.953 GB

Volume used       52 x 4096 212992 Bytes           0.0001 GB

space available   212992 - 2097291264 = 2097078272  1.953 GB .

 

Percentage 0.0001/1.953 * 100 0.0%

For Linux Server for Poller assigned N.Memory.SNMP.NetSnmpReal

memory .JPG

 

If poller assigned

N.Memory.SNMP.NetSnmpReal

 

/// memTotalReal = 1.3.6.1.4.1.2021.4.5.
/// memAvailReal = 1.3.6.1.4.1.2021.4.6.
/// memCached = 1.3.6.1.4.1.2021.4.15.
/// memBuffer = 1.3.6.1.4.1.2021.4.14.

/// UsedMemory = (totalMem - availMem - cachedMem - bufferMem) * 1024
 

.1.3.6.1.4.1.2021.4.5.0 = INTEGER: 2073620 (Total )

.1.3.6.1.4.1.2021.4.6.0 = INTEGER: 1869968 (Available )

.1.3.6.1.4.1.2021.4.15.0 = INTEGER: 88008 (cachedMemory )

.1.3.6.1.4.1.2021.4.14.0 = INTEGER: 51868 (BufferMemory )

( 2073620 – 1869968 – 88008 – 51868 ) = 63776  

63776 * 1024 = 65306624 bytes

Calculations in SNMP do not match what is found when the OS is queried?

 

Check to see if the latest supported version of NET-SNMP is installed on the machine:

# snmp --version

 

Click here for the latest currently supported versions of NET-SNMP.  (© 2016 NET_SNMP, available at http://www.net-snmp.org/, obtained on July 29, 2016.)

 

Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment.  You elect to use third party content at your own risk, and you will be solely responsible for the incorporation of the same, if any.

 

 

 

Last modified
08:50, 3 Aug 2016

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