[mrtg] Re: Memory + Buffers + Cache

Alex van den Bogaerdt alex at ergens.op.het.net
Tue May 27 17:36:25 MEST 2003

On Tue, May 27, 2003 at 10:09:54AM -0500, Brandon Lederer wrote:

> I am trying to graph the total amount free of Memory + Buffers + Cache, I
> just cant find the right target line.  I know you can do some math on the
> target Line, and I have found all the numbers I need to put together to get
> the value I want.  I just cant get it to work.  The number I am trying to
> get is + +
> and graph this on the Green.  Then I want to graph
> on the blue line.  I just cant make the target line
> work.

MRTG works in pairs.  Only.  No exception.

Labels for this discussion:
   OID1 :==
   OID2 :==
   OID3 :==
   OID4 :==


1 find an OID that returns zero (labeled OID0)
  report OID1&OID0 + OID2&OID0 + OID3&OID4

  this internally results in (OID1+OID2+OID3)&(0+0+OID4)

2 write a script that returns the 4 lines as described in the docs
  use the external program interface of mrtg

3 use mrtg to collect data and use rrdtool with a suitable front end
  to report this data ("suitable" could be "your home grown")


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