[mrtg] Re: Scripts default to "gauge" type?

[robert.harrowfield at axon.co.nz]

David,

Im using 2.9.17 with scripts to query some devices, one of the counters is a
cumulative counter, whereas the rest are gauge type. The non-incrementers
(eg Temp) are all marked as 'gauge' and work fine. The incrementing counter
has no options set (other than a 'nopercent') and that is working fine too. 

I would suggest going up to the latest version (or at least the latest
stable - 2.9.17) before trying to fault-find the issue. Have a browse
through the CHANGES file for anything that might point to issues like this
too.

Be careful though, as I have seen a few changes in the way mrtg handles 'no
data' situations. It appears to me that they are moving toward rrd more and
more, and rateup isnt really being worked on.

Rob.

> -----Original Message-----
> From: Liebert, David (NZ) [mailto:David.Liebert at Compaq.com]
> Sent: 27 March 2002 10:24AM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Scripts default to "gauge" type?
> 
> 
> 
> When I use a script in MRTG (i.e., using the back quote 
> syntax) this seems to force it to use the "gauge" type.
>  
> This is a real pain because in many cases the "natural" form 
> of the data is cumulative so I want and expect MRTG to use 
> its "normal" method of calculating a five minute 
> differential.  This means that I have to write a more 
> complicated script which reads the values, waits five 
> minutes, reads the values again, subtracts, etc.  Of course 
> this all needs to be scheduled and written to a file which is 
> then read by MRTG using the back-quote syntax.
>  
> I really don't understand why this is necessary because I am 
> NOT using the "gauge" keyword.  Why is it not documented that 
> values returned by a script are always treated as "gauge" 
> even if the "gauge" keyword is not used?
>  
> There is a keyword for "gauge" and "absolute", so why is 
> there not a keyword I can use to force the "normal" behaviour?
>  
> Maybe my MRTG version is buggy.  It is 2.9.6?
>  
> As an example, I use a script to get network interface byte 
> counters (which are cumulative 32 bit values).  These 
> counters are identical to similar interface counter values 
> used by SNMP.  (I'm not using SNMP because of firewall issues 
> which I won't go into here.)  What I would like to do is have 
> my script just return the raw interface counter values, but 
> instead I have to complicate the script by working out a five 
> minute differential.  The five minute differential then 
> graphs perfectly, even though I am NOT using the "gauge" 
> keyword.  If don't calculate a five minute differential 
> myself I get a useless graph which rises more-or-less constantly.
> > 

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