[rrd-users] Strange peaks (again, not counter reset related)

[Yann Bizeul]

Hi list,
	First of all, here is my rrd definition :

	rrdtool create updates.rrd -s 300 DS:queries:DERIVE:300:0:U 
RRA:AVERAGE:0.5:1:500 RRA:AVERAGE:0.5:12:500 RRA:AVERAGE:0.5:288:500

	Now I have a script that makes a SQL query, and call rrdtool update on 
this database. This script runs every 300s (5mn).

	My problem is I get some peaks from time to time that I don't 
understand, according to the output :

My script gives those values to the RRD database:
Mon Sep 20 09:20:01 CEST 2004 5610
Mon Sep 20 09:25:02 CEST 2004 5613
Mon Sep 20 09:30:01 CEST 2004 5615
Mon Sep 20 09:35:01 CEST 2004 5619
Mon Sep 20 09:40:01 CEST 2004 5624
Mon Sep 20 09:45:01 CEST 2004 5626
Mon Sep 20 09:50:01 CEST 2004 5631
Mon Sep 20 09:55:02 CEST 2004 5631
Mon Sep 20 10:00:01 CEST 2004 5634
Mon Sep 20 10:05:01 CEST 2004 5635

The Database contains those values :
                         <!-- 2004-09-20 09:20:00 CEST / 1095664800 --> 
<row><v> 2.7801538335e+01 </v></row>
                         <!-- 2004-09-20 09:25:00 CEST / 1095665100 --> 
<row><v> 1.8701825533e+01 </v></row>
                         <!-- 2004-09-20 09:30:00 CEST / 1095665400 --> 
<row><v> 2.2390648012e+01 </v></row>
                         <!-- 2004-09-20 09:35:00 CEST / 1095665700 --> 
<row><v> 2.4029956101e+01 </v></row>
                         <!-- 2004-09-20 09:40:00 CEST / 1095666000 --> 
<row><v> 2.0335804672e+01 </v></row>
                         <!-- 2004-09-20 09:45:00 CEST / 1095666300 --> 
<row><v> 2.9100288044e+01 </v></row>
                         <!-- 2004-09-20 09:50:00 CEST / 1095666600 --> 
<row><v> 1.6506062137e+01 </v></row>
                         <!-- 2004-09-20 09:55:00 CEST / 1095666900 --> 
<row><v> 1.4075000000e+03 </v></row>

If the numbers stored in the DB correspond to units/hours, I should 
have values about 24, but I can't explain this jump to 140 :-/

Thanks for your help
-- 
Yann Bizeul - yann at tynsoe.org
Cocoa Developer, visit my projects at :
http://projects.tynsoe.org/

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