I'm trying to understand what's going on with rrdtool
so I've been creating a test rrd file and examining
the results.
My third question is about rrdfetch. Here's what I did:
$ rrdtool create test.rrd \
--start '12 am 1/1/2001' \
--step 86400 \
DS:one:ABSOLUTE:86400:U:U \
RRA:LAST:0.5:1:5
$ rrdtool dump test.rrd | fgrep '<row>'
<!-- 2000-12-27 18:00:00 CST / 977961600 --> <row><v> NaN </v></row>
<!-- 2000-12-28 18:00:00 CST / 978048000 --> <row><v> NaN </v></row>
<!-- 2000-12-29 18:00:00 CST / 978134400 --> <row><v> NaN </v></row>
<!-- 2000-12-30 18:00:00 CST / 978220800 --> <row><v> NaN </v></row>
<!-- 2000-12-31 18:00:00 CST / 978307200 --> <row><v> NaN </v></row>
$ n=1
$ while [ $n -le 5 ]
> do
> t=$(( 978307200 + $n * 86400 ))
> rrdtool update test.rrd $t:$RANDOM
> n=$(( n + 1 ))
> done
$ rrdtool fetch test.rrd LAST -s '1/3/2001' -e '1/3/2001'
one
978566400: 2.8596064815e-01
978652800: 1.4814814815e-01
$ date -d '0:0:0 1/1/1970 utc + 978566400 sec'
Wed Jan 3 18:00:00 CST 2001
$ date -d '0:0:0 1/1/1970 utc + 978652800 sec'
Thu Jan 4 18:00:00 CST 2001
So, why is rrdfetch giving me 1/4's data? I only wanted one
day's value. Is this a bug? Maybe it's because the time slots
are not aligned on a day? (Refer to my question #1)
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