[rrd-users] Re: rrdtool grids and start times!!

[Tobias Oetiker]

Yesterday you sent me mail regarding [rrd-users] rrdtool grids and start...:

*> Hi All,
*> 
*>       Thanks for all the continued help from every one
*> and ofcourse to Tobi!!
*> 1.
*> 	I went thru rrdtool create documentation and i have some doubts on
*> specifying the parameters. What happens if we specify both the "starttime"
*> and "step"
*> interval when we create a rrd data base, how does this
*> affect as far as graphing part is concerned. 

only the step affects the graphing ... it gives the lowest resolution
possible ... but then again what actually will show in the graphdepends on
the resolution of your RRAs
*> 
*> 2.    Also does the tool overwrites the $filename.rrd files or does it
*> append the data if an $filename.rrd
*> already exists.  

create overwrites  .... 
*> 
*> 3.  when we say 
*> 
*> rrdtool create 
*> DEF:max=$filename.rrd:rraname:MAX does rrdtool always trys to graph these
*> values continuously or does it wait untill it completes a full interval to
*> show it on the
*> graph. I mean like RRA:MIN:0.5:6:48. So does it wait 
*> untill 6*48 units before it can display the values on
*> the graph. How can i make them display these values continuously.

you mean rrdtool graph I guess 

the RRAs are updated when an intervall is completed ... 

*> 
*> 4. In the --x-grid configuration what are all the different types of formats
*> that we can get. In the documentation they discussed about %X. If somebody
*> can
*> give little more detail into these formats and what they
*> mean or may be point me to a document or some examples,
*> that would really help me.

man strftime will show you what is there ... 

cheers
tobi
*> 
*> thanks,
*> siva  
*> 
*> -----Original Message-----
*> From: EXT Tobias Oetiker [mailto:oetiker at ee.ethz.ch]
*> Sent: Tuesday, January 25, 2000 1:41 PM
*> To: Chris Josephes
*> Cc: rrd-users at list.ee.ethz.ch
*> Subject: [rrd-users] Re: Multiple targets in one RRD, and wrapping
*> counters.
*> 
*> 
*> 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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*> *> 
*> 
*> 

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