[rrd-users] Re: Data Conversion/Issue(s)??

[Gellatly, Laurie]

Douglas,
As you didn't give specific times in your sample data its a bit 
difficult to see how they match to you fetch.
However, if you are using COUNTER, then you would expect
the numbers in the RRD to be 
(value at timeX - value at timeX-1)/(timeX - timeX-1).
i.e. what is the rate per second


			...Laurie :{)

-----Original Message-----
From: Douglas R. Mauro [mailto:doug at mauro.com]
Sent: Thursday, 11 January 2001 4:09
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Data Conversion/Issue(s)??




Can you tell me why my data looks so funny (wrong) ??

I'm trying to push some data with:

rrdtool update myrouter.rrd N:267821925:20944716
rrdtool update myrouter.rrd N:267821925:20948633
. blah
. blah
.

Note that the numbers are pretty big.  Now when I fetch look what I get?

rrdtool fetch /tmp/gg/myrouter.rrd AVERAGE --start -60min

            input            output
 979136700: NaN NaN
 979137000: NaN NaN
 979137300: 8.8828260870e+02 2.9260869565e+01
 979137600: 1.3062894893e+03 5.6148930297e+01
 979137900: 7.0555488630e+03 1.6408999114e+02
 979138200: 4.6983517132e+03 9.9709547886e+01
 979138500: 1.5006727604e+04 1.1251607986e+02
 979138800: 3.8324676923e+03 7.0591682692e+01
 979139100: 3.8570030476e+03 7.1427047619e+01
 979139400: 5.3599769524e+03 9.5546285714e+01
 979139700: NaN NaN
 979140000: NaN NaN
 979140300: NaN NaN
 979140600: NaN NaN

These numbers are not even close to what I got before?  Am I missing
something?

I can't convert these back to anything close to the original numbers.

Here is a little script I wrote to see if I could at least see some
patterns.  This basically uses time and a random number.  The graphs for the
random number look random but the time is (for the most part) a horizontal
line??

Heres the script:

while true
do
        etime=`perl -e 'print time, "\n" '`
        echo "using epoc as :$etime:"
        rnum=`perl -e 'print rand(1000), "\n" '`
        echo "using rnum as :$rnum:"
        echo "rrdtool update db1.rrd N:$etime:$rnum"
        rrdtool update db1.rrd N:$etime:$rnum
        echo "Fetching"
        rrdtool fetch db1.rrd AVERAGE --start -5min
        echo "Sleeping for 5"
        sleep 5
        echo; echo; echo;
done


Here is the output:

using epoc as :979145754:
using rnum as :125.8544921875:
rrdtool update db1.rrd N:979145754:125.8544921875
Fetching
                    epoch          rnum

 979145430: 1.0066666667e+00 5.3293185764e+01
 979145460: 1.0000000000e+00 7.6229926215e+01
 979145490: 1.0000000000e+00 9.4349568685e+01
 979145520: 1.0000000000e+00 8.0090196398e+01
 979145550: 1.0000000000e+00 6.4478895399e+01
 979145580: 1.0000000000e+00 9.1949055990e+01
 979145610: 1.0000000000e+00 1.0993591309e+02
 979145640: 1.0000000000e+00 7.5236002604e+01
 979145670: 1.0000000000e+00 8.6906941732e+01
 979145700: 9.9444444444e-01 1.0479109022e+02
 979145730: 9.9222222222e-01 1.0253394233e+02
 979145760: NaN NaN
Sleeping for 5



using epoc as :979145759:
using rnum as :996.2158203125:
rrdtool update db1.rrd N:979145759:996.2158203125
Fetching
                    epoch          rnum

 979145430: 1.0066666667e+00 5.3293185764e+01
 979145460: 1.0000000000e+00 7.6229926215e+01
 979145490: 1.0000000000e+00 9.4349568685e+01
 979145520: 1.0000000000e+00 8.0090196398e+01
 979145550: 1.0000000000e+00 6.4478895399e+01
 979145580: 1.0000000000e+00 9.1949055990e+01
 979145610: 1.0000000000e+00 1.0993591309e+02
 979145640: 1.0000000000e+00 7.5236002604e+01
 979145670: 1.0000000000e+00 8.6906941732e+01
 979145700: 9.9444444444e-01 1.0479109022e+02
 979145730: 9.9222222222e-01 1.0253394233e+02
 979145760: NaN NaN
Sleeping for 5

Thanks for any help,

Douglas


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