[rrd-users] Re: RRDTOOL Create Configuration

[estreigh at nexl.com]

I was thinking exactly the same thing... and I went ahead and gave it a
shot. When creating a database it is prepopulated with Unk data, therefore
the size is immediately evident.

Creating a database with a single data set is unlikely for most and
certainly out of the question for my purposes, so my test includes four data
sets. Also, I want to show the maximum of maxima and minimum of minima in my
graphs (thanks Alex ;-)) so I will use three RRAs, one for MAX, one for MIN
and a third for AVERAGE.

rrdtool create c:\rrdtool\output\estreigh-lptp	\
	--step 300						\
	DS:procPercentUser:GAUGE:900:U:U		\
	DS:procPercentInter:GAUGE:900:U:U		\
	DS:procPercentProc:GAUGE:900:U:U		\
	DS:procPercentPriv:GAUGE:900:U:U		\
	RRA:MIN:0.5:1:525600				\
	RRA:MAX:0.5:1:525600				\
	RRA:AVERAGE:0.5:1:525600			

Disk space used = 49Mb

I have not yet attempted to run regular updates to this database and
therefore I have not built any graphs from it. It took approximately 8
seconds to build the database, which I thought was pretty fast. The updates
do not concern me so much, but graph creation needs to be pretty quick to
meet the demands of my customers. I'll let you know how it goes...

As for you question regarding the method of consolidation, from the manual I
quoath,
" The DEF call automatically chooses an RRA which contains CF consolidated
data in a resolution appropriate for the size of the graph to be drawn.
Ideally this means that one data point from the RRA should be represented by
one pixel in the graph. If the resolution of the RRA is higher than the
resolution of the graph, the data in the RRA will be further consolidated
according to the consolidation function ( CF) chosen".

Regards,
Erik Streight
estreigh at nexl.com

> -----Original Message-----
> From: Nuno Emanuel Rodrigues [mailto:nuno.erodrigues at optimus.pt]
> Sent: Monday, November 12, 2001 8:54 AM
> To: rrd-users at list.ee.ethz.ch
> Subject: [rrd-users] RRDTOOL Create Configuration
> 
> 
> 
> 	Hello.
> 	I started using RRDTool 1 month ago, and I think I have a good
> knowledge on the way RRDTool works.
> 
> 	I am using RRDTool to show some stats about users connected to
> server, space free on hd..that kind of stuff.
> 
> 	I have a site with all the statistics, with 4 different graphics for
> each rrd database, 1 daily intervale, weekly, monthly and yearly.
> 
> 	In a 5 minute updating interval i have 4 RRAs with this
> configuration:
> 	heartbeat=600
> 
> 	RRA1:steps=1 ; rows = 288
> 	RRA2:steps=6; rows = 2016
> 	RRA3:steps=24; rows = 8928
> 	RRA4:steps=288; rows = 105120
> 
> 	My intention is clear...make rrd use RRA1 for daily graph, RRA2 for
> weekly.... and so on..
> 
> 	The problem i have is that i loose the exact values....for example,
> i cant retrieve the exact values for 25 of October.. i will get
> consolidated
> values, 30 minutes averages.
> 
> 	So i thought why not just use a singe RRA with no consolidation?
> 	My question is:  with just a RRA with steps = 1 and rows =105120
> (number of samples p/ year with 5 minutes updates) will rrdtool create my
> graphs correctly to my 4 graphs(daily,weekly,monthly and yearly)?
> 
> 	I suppose the database will take around 3 or 4 Mbs..but is not a
> very big problem for me.
> 
> 	And for a yearly graph, off course isnt impossible to plot all the
> values, so some consolidation will have to be done...so what kind of
> consolidation will rrdtool do?
> 
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