[rrd-users] Re: Multiple targets in one RRD, and wrapping counters.

[Alex van den Bogaerdt]

Chris Josephes wrote:
> 
> One idea I had was to avoid saving aggregated data altogether.  Instead, I
> would just create a RRD graph that would be built from the values in
> individual RRDs.
> 
> For example:
> 
> rrdtool graph total.png \
> 	DEF:r1in=router1.rrd:inoctets:AVERAGE   \
> 	DEF:r2in=router2.rrd:inoctets:AVERAGE   \
> 	DEF:r1out=router1.rrd:outoctets:AVERAGE \
> 	DEF:r2out=router2.rrd:outoctets:AVERAGE \
> 	"CDEF:inoctets=r1in,r2in,+"             \
> 	"CDEF:outoctets=r1out,r2out,+"          \
> 	LINE2:inoctets#ff0000                   \
> 	AREA:outoctets#00ff00                   \
> 

This is pretty normal to do.  You can add the values from many databases
this way.  One thing to take in consideration is the following:

If you have an unknown value in one of the databases, and you add this
unknown value to the others, you end up with an unknown value.
So:  1+2+3+4+5+unknown equals unknown and it does not equal 15.

There are some examples available in the three tutorials and in the
manual pages.

regards,
-- 
   __________________________________________________________________
 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
| work                                                         private |
| My employer is capable of speaking therefore I speak only for myself |
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