Comments on: Linux SNMP OID’s for CPU,Memory and Disk Statistics

By: Prasanna K S

Prasanna K S — Sat, 07 Nov 2009 01:51:59 +0000

Thank you. It helped a lot to get my redhat system managed.
Please correct the memory mistake (interchanged text of one OID)

By: srinu

srinu — Tue, 01 Sep 2009 06:21:43 +0000

hi,

unable to get the disk details.Please let me know how get the details like totaldisk,useddisk and availdisk

Thanks in advance

By: Michal Zyzak

Michal Zyzak — Wed, 19 Aug 2009 13:17:56 +0000

Very good article!

But I have a question about monitoring multicore CPUs.
Is it possible to get load of each core via SNMP ?
If so – wchich OID do I have to watch?

Regards

By: Michael Schwager

Michael Schwager — Thu, 16 Jul 2009 16:41:09 +0000

Nice article, thanks. But that error in Total RAM used: .1.3.6.1.4.1.2021.4.6.0 screwed me up. Can you fix that in your article?

Also, something that may be helpful: According to (http://mail.nl.linux.org/linux-mm/2003-03/msg00077.html) if we did this we could get a reasonable reading of our memory:
(Used – buffers – cached) / Total * 100 = % memory used

So you could get the following (expressed as Perl code):
my $memRealTotalOID = '.1.3.6.1.4.1.2021.4.5.0'; my $memRealAvailOID = '.1.3.6.1.4.1.2021.4.6.0'; my $memRealBuffersOID = '.1.3.6.1.4.1.2021.4.14.0'; my $memRealCachedOID = '.1.3.6.1.4.1.2021.4.15.0'; # Memory Calculations my $memRealUsed = $memRealTotal - $memRealAvail;
Then you can alert on % RAM used:
my $realPercent = (($memRealUsed - $memRealBuffers - $memRealCached )/ $memRealTotal) * 100;
Hope this helps.

By: joe martin

joe martin — Thu, 21 May 2009 19:26:20 +0000

snmptranslate .1.3.6.1.4.1.2021.100.4.0
UCD-SNMP-MIB::versionCDate.0

By: joe martin

joe martin — Thu, 21 May 2009 19:23:21 +0000

Looks like the following OID returns current date/time

.1.3.6.1.4.1.2021.100.4.0+

sample:
# date;snmpwalk -Cc -On -v2c -c public localhost .1.3.6.1.4.1.2021.100.4.0
Thu May 21 14:21:47 CDT 2009
.1.3.6.1.4.1.2021.100.4.0 = STRING: Thu May 21 14:21:47 2009

By: John

John — Tue, 12 May 2009 07:54:57 +0000

Hye does anyone know the OID for getting the remote timestamp from the machine that you are querying? if so It would be much appreciated.

Cheers

John

By: Derek

Derek — Fri, 01 May 2009 07:48:25 +0000

Great article and a nice summary.

By: deisecairo

deisecairo — Thu, 22 Jan 2009 10:08:55 +0000

You are right, Eduardo.

The Mem info coming from OIDs 1.3.6.1.4.1.2021.4.4.0 and 1.3.6.1.4.1.2021.4.6.0 is the just the free Swap memory and the free RAM memory in the machine. So, you can get the used Swap memory and the RAM used memory doing the difference between the Total Swap memory and the free Swap memory for the used Swap memory, and the difference between the Total RAM memory and the free RAM memory for the used RAM memory.

The OID 1.3.6.1.4.1.2021.4.11.0 is for the Total free memory in the machine (free Swap memory + free RAM memory).

Regards.

By: Eduardo

Eduardo — Mon, 12 Jan 2009 17:32:37 +0000

There is an error on description for OID .1.3.6.1.4.1.2021.4.6.0
It is not “Total RAM used” as stated here, but instead, is the available real memory.

By: allucardster

allucardster — Thu, 04 Dec 2008 15:58:13 +0000

hey thank you very much for the OID. In fact, I served much

Sayonara