[mrtg] Re: Memory usage on Cisco 2500

[David Mitchell]

Folks

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...

OID1/(OID1+OID2))*100
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.



Dave

-----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 1.3.6.1.4.1.9.9.48.1.1.

And the OID's I want to use are:
1.3.6.1.4.1.9.9.48.1.1.1.5.1 Proc mem in use
1.3.6.1.4.1.9.9.48.1.1.1.6.1 Proc Mem free
1.3.6.1.4.1.9.9.48.1.1.1.5.2 IO mem in use
1.3.6.1.4.1.9.9.48.1.1.1.6.2 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]: 1.3.6.1.4.1.9.9.48.1.1.1.5.1 *
00/( 1.3.6.1.4.1.9.9.48.1.1.1.5.1 + 1.3.6.1.4.1.9.9.48.1.1.1.6.1 ) &
1.3.6.1.4.1.9.9.48.1.1.1.5.2 *100/( 1.3.6.1.4.1.9.9.48.1.1.1.5.2 +
1.3.6.1.4.1.9.9.48.1.1.1.6.2 ):routeraddress


David Mitchell


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