Hi,
a may be strange thing i don't understand. Executing the following command
(starting date string represents Feb 04, 08:00 local time)
>rrdtool create test.rrd \
> -b 1075878000 --step 3600 \
> DS:var1:GAUGE:86400:U:U RRA:MAX:0.5:1:5 \
> DS:var2:GAUGE:86400:U:U RRA:MAX:0.5:1:5
and then
>rrdtool dump mail.rrd
gives the following output for the RRAs:
------------------snip----------------------------
....
<!-- 2004-02-04 04:00:00 CET / 1075863600 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 05:00:00 CET / 1075867200 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 06:00:00 CET / 1075870800 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 07:00:00 CET / 1075874400 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 08:00:00 CET / 1075878000 --> <row><v> NaN </v><v> NaN
</v></row>
</database>
------------------snap----------------------------
Well, thats what i would expect. Starting date is 2004-02-04 at 08:00 CET, and
the entrys 'step down' with a gap of 3600 seconds, which is indeed one hour.
Fine.
Now, lets change the command line and set the step to two hours:
>rrdtool create test.rrd \
> -b 1075878000 --step 7200 \
> DS:var1:GAUGE:86400:U:U RRA:MAX:0.5:1:5 \
> DS:var2:GAUGE:86400:U:U RRA:MAX:0.5:1:5
and now
>rrdtool dump mail.rrd
gives me this:
------------------snip----------------------------
<!-- 2004-02-03 23:00:00 CET / 1075845600 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 01:00:00 CET / 1075852800 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 03:00:00 CET / 1075860000 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 05:00:00 CET / 1075867200 --> <row><v> NaN </v><v> NaN
</v></row>
<!-- 2004-02-04 07:00:00 CET / 1075874400 --> <row><v> NaN </v><v> NaN
</v></row>
</database>
------------------snap----------------------------
. Hmm....the step is ok (two hours as wanted), but what has happened to the
time slot for the latest value? It has changed to 2004-02-04 07:00:00,
allthough i didn't change the start time of the rrd.
What's the thing i haven't understood so far?
rrdtool 1.0.45-1 on debian linux 2.4.19-xfs
Thank you very much in advance,
Thorsten
++
Dipl.-Ing.
Thorsten Volkmer-Wolf
IT-Support & Services
AEROTEC Engineering GmbH
Hein-Saß-Weg 38
21129 Hamburg / Germany
fon +49 (0)40/742 198-241
fax +49 (0)40/742 198-111
<http://www.aerotec.de>
--
Unsubscribe mailto:[EMAIL PROTECTED]
Help mailto:[EMAIL PROTECTED]
Archive http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
