[rrd-users] rrdtool / rra misunderstanding?

[wanni]

Hi,

im trying to meter my gas mileage (at home) with some electronical stuff and
want to store the output in a rra.

I'm fetching the counter (resetetd to zero when read) from my gasmetering
system with an snmp device and that works fine.

in1=`snmpget -Oqv -v1 -c public 192.168.1.200
1.3.6.1.4.1.5040.1.2.4.1.3.1.3.1`
echo $in1 > test.txt
rrdtool update gas.rrd N:$in1

the test.txt is for debuggin purposes only and contains the actual value
(mostly between 0 and 30, Integer)

i opened my rra with following command:

rrdtool create gas.rrd
-- start 1254344400
-- step 3600
DS:gasverbrauch:ABSOLUTE:7200:U:U
RRA:AVERAGE:0.5:1:24
RRA:AVERAGE:0.5:24:31
RRA:AVERAGE:0.5:24:3650

my expection was to get some integer values in the rra, but the output
(rrdtool fetch) looks like this:

1254344400: 5.1041666667e-02
1254348000: 0.0000000000e+00
1254351600: 0.0000000000e+00
1254355200: 0.0000000000e+00
1254358800: 0.0000000000e+00
1254362400: 0.0000000000e+00
1254366000: 0.0000000000e+00
1254369600: 2.2205615410e-03
1254373200: 2.2227032103e-03
1254376800: 1.1116401983e-03
1254380400: 6.5060599358e-07
1254384000: 0.0000000000e+00
1254387600: 0.0000000000e+00
1254391200: 0.0000000000e+00
1254394800: 0.0000000000e+00
1254398400: 0.0000000000e+00
1254402000: 0.0000000000e+00
1254405600: 0.0000000000e+00
1254409200: 5.5522882977e-04
1254412800: 1.1107876430e-03
1254416400: nan

why are ther so small values? they far away from being an integer ... I
can't understand.

Where is the mistake I've made?

regards

Thomas
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