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

[Tobias Oetiker]

Today you sent me mail regarding [rrd-users] Multiple targets in one RRD,...:

*> Currently, I'm monitoring about 500+ hosts with MRTG2.8.9 and slowly but
*> surely I'm moving my way towards building yet another RRDTool frontend
*> that will take over the job.
*> 
*> One particular target we have is an aggregate of all of our core routers.
*> We've been playing around with it recently because we activated a couple
*> of OC3 circuits in the past week.
*> 
*> I'm not expecting very accurate data due to counter wraps on some hosts.
*> But I'm wondering how I could correct this with RRDTool.
*> 
*> 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 will work fine ... you can agregate many more if you want ...

cheer
tobi
*> Has anyone else dealt with this issue?
*> 
*> --                      _______________
*>  Chris Josephes      __/ MRNet/Onvoy   \
*>  chrisj at mr.net    __/   www.onvoy.com  /
*> \________________/
*> 
*> 
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