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

[Siva.Namburi at nokia.com]

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. 

2.    Also does the tool overwrites the $filename.rrd files or does it
append the data if an $filename.rrd
already exists.  

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.

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.

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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