[rrd-users] Simple questions about RRD
jyavenard at gmail.com
Sat Dec 5 14:01:53 CET 2009
2009/12/5 A Darren Dunham <ddunham at taos.com>:
> You can change the RRA's consolidation function at the top easily to see
> how if it were AVERAGE already, there's no differences between the
> second two graphs.
> Hopefully that demonstrates the differences pretty well.
It does ... thank you for enlighting me
As I was thinking more into yesterday ; I too had felt that for
AVERAGE is result would be quite obvious ; but for the MIN and MAX
some issues would arise...
Now I have an extra question on how the RRA/consolidation works...
Say I store 5 years of 5 minutes average ; is there any points of also
storing 5 years of 30 minutes average, 5 years of 2 hours average etc?
I would have assumed that it wouldn't matter ; except when retrieving
the 30 minutes/2 hours average extra processing is required as it
needs to retrieve more values.
Now; if I use reduce=AVERAGE for all my graph like
DEF:total=currentcost.rrd:total:AVERAGE DEF:ch2=currentcost.rrd:ch2:AVERAGE \
DEF:solar=solarprod.rrd:total:AVERAGE DEF:ch1=currentcost.rrd:ch1:AVERAGE \
Do I even need to create the RRD with MIN and MAX ? or it can be all
done from the AVERAGE RRD database ?
In my case, I create the RRD with:
100 day of 1 minute average
5 years of 5 minutes average
rrdtool create currentcost.rrd -s 60 \
Not creating a MIN and MAX one would reduce considerably the size rrd file.
Here is my result so far ... You can click on parts of the graph to
automatically zoom-in for extra details.
More information about the rrd-users