[rrd-users] Data differ from RRA to RRA - normal?

[Heiko Teichmann]

Hello,

I'm using rrdtool together with mrtg and wan't to read the data with a
php script (similar to mrts). Now I facing some problems according to
the different RRA I used.

When I fill up the rra with data and compare the data for the "last" day
with the following command (<resolution> : 300, 1800, 7200, 86400) I got
different results (for the same range of time):

rrdtool fetch data.rrd AVERAGE -r <resolution> -s 1160438400 -e 1160524800

Resolution | Result
86400	|	1,7567
7200	|	1,7611
1800	|	1,7201
300	|	1,7201

I though it could not differ, because the small resolution (300)
database feed the larger one (1800) and so on ?

Where is my fault?

Heiko


------
info data.rrd

rrd_version = "0003"
step = 300
ds[ds0].type = "COUNTER"
ds[ds0].minimal_heartbeat = 600
ds[ds1].type = "COUNTER"
ds[ds1].minimal_heartbeat = 600
rra[0].cf = "AVERAGE"
rra[0].rows = 800
rra[0].pdp_per_row = 1
rra[1].cf = "AVERAGE"
rra[1].rows = 800
rra[2].cf = "AVERAGE"
rra[2].rows = 800
rra[2].pdp_per_row = 24
rra[3].cf = "AVERAGE"
rra[3].rows = 800
rra[3].pdp_per_row = 288


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