[mrtg] Re: Memory usage on Cisco 2500

David Mitchell mitchelld at sunman.co.uk
Fri Feb 22 11:32:49 MET 2002


I have done something similar but used %age of memory used - which then
means that you can scale the graphs to 100%. It also is proof against the
router resizing IO memory - I would think we are more interested in how much
of the allocated memory is in use rather than the absolute size?

I have pasted my question and answer below (it was in a thread entitled
'multiple OIDs in expression')


For easy viewing, lets say...
OID1 = .5.1 Proc mem in use
OID2 = .6.1 Proc Mem free
OID3 = .5.2 IO mem in use
OID4 = .6.2 IO mem free.

You want...

460 /(460 + 564))* 100 = 46%

So for your target you should try...

Target[Proc_IO] (OID1&OID3:public at host  /
                (OID1&OID3:public at host +
                 OID2&OID4:public at host)) * 100

Let me know if this works.


-----Original Message-----
From: David Mitchell [mailto:mitchelld at sunman.co.uk]

I want to calculate the percentage memory usage on a cisco router.

The table oid is

And the OID's I want to use are: Proc mem in use Proc Mem free IO mem in use IO mem free.

So I want to calculate 100*mem in use / (mem in use + mem free) and use the
Proc mem as the 'in' value and IO mem as the 'out' value so they appear on
the same graph.

The original target I used was:
Target[$target_name]: *
00/( + ) & *100/( + ):routeraddress

David Mitchell

Unsubscribe mailto:mrtg-request at list.ee.ethz.ch?subject=unsubscribe
Archive     http://www.ee.ethz.ch/~slist/mrtg
FAQ         http://faq.mrtg.org    Homepage     http://www.mrtg.org
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

More information about the mrtg mailing list