[rrd-users] Re: create question

[Alex van den Bogaerdt]

Alejandro Diego Garin wrote:

> I need to collect the data between 60 seg, so I have created this rrd:
> 
> --step = 60
> --start = (I have logs from 2 months ago)
> "DS:concurrent:GAUGE:60:U:U"
> "RRA:MAX:0.5:1:525600"   
> 
> I need to store one year of data. (60minx24hsx365days=525600)
> 
> Could you tell me if this configuration is okey if I need to graph 
> weekly, montly or yearly?
> 
> I have seen some configurations that uses varios RRA for the same
> data source, but I don't understand why is needed?

It will work.  However the standard graph width is 400 pixels so it
makes sense to store 400*24*60 intervals.

If you'll be creating daily, weekly, monthly and yearly graphs and no
other kind (such as: show the data for 20 weeks ago in high resolution)
then you're storing way too much information.

Just understand what happens while creating the yearly graph:
RRDtool will have to take 1440 values and find the largest of
those values.  The result, one value, is plotted on the graph.
This process has to be done for each and every pixel.

If you'd have an RRA that already did this at update time, it
would not have to be done at graph time.  Also: you'd only have
400 rows, not 400*1440=576000.  Ergo, you'd be saving resources,
namely disk space, and you don't have to wait for your graph when
creating it on demand (such as 14all.cgi does).

So, you don't have to have these extra RRAs but it may help.

HTH
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