[rrd-users] Re: RRDGRAPH : choose the RRA resolution used to generate the graphs ?

[Alex van den Bogaerdt]

On Sat, Jan 17, 2004 at 06:22:03PM +0100, Thomas Bleau wrote:
> Hello, i created a RRD database for graphing the outdoor temperature. So, i
> decided to store the data in several resolutions with RRA archives. I have a
> problem because the finest resolution is always used by the rrdtool graph
> command. How can i choose a specific resolution or a specific RRA ?

RRDtool selects the "best" matching RRA.

> This is a piece of my rrdtool create command :
>     'RRA:MIN:0.5:6:2880', # 1 minute summary for 48 hours (2 day)
>     'RRA:AVERAGE:0.5:6:2880',   # 1 minute summary for 48 hours (2 day)
>     'RRA:MAX:0.5:6:2880',       # 1 minute summary for 48 hours (2 day)
> 
>     'RRA:MIN:0.5:90:1344', # 1/4 hour summary for 14 day (2 week)
>     'RRA:AVERAGE:0.5:90:1344',  # 1/4 hour summary for 14 day (2 week)
>     'RRA:MAX:0.5:90:1344',      # 1/4 hour summary for 14 day (2 week)
> 
>     'RRA:MIN:0.5:360:1440', # 1 hour summary for 60 days (2 month)
>     'RRA:AVERAGE:0.5:360:1440', # 1 hour summary for 60 days (2 month)
>     'RRA:MAX:0.5:360:1440',     # 1 hour summary for 60 days (2 month)

Your PDP size seems to be 10 seconds.  6 of them are used to create
one CDP in the first RRA.  This is one minute per CDP.

90 PDPs, thus 900 seconds, per row in the 2nd RRA, 3600 seconds per CDP
in the last.

Try selecting --start end-400h --end [a whole multiple of 3600]
(fill in the part between []), then do the same with a number that
is 900 seconds later or earlier.

IIRC this should make a difference.

HTH
Alex
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