[rrd-users] Re: Possible problem?

Tobias Oetiker oetiker at ee.ethz.ch
Thu Jul 29 19:57:37 MEST 1999

Today you sent me mail regarding [rrd-users] Possible problem?:

*> So I've setup cricket to collect some stuff, and yesterday things were a
*> little weird around here.  The net went down a number of times (should not
*> have affected the following stats, as the router was further up the chain),
*> and this morning, I thought I'd have a look-see at the data, and see how
*> things looked.
*> For some strange reason, I'm seeing only 1 negative spike in the data.  IE:
*> the graph says that we had 0 bytes/sec, with one negative bytes/sec spike.
*> Very weird.  I've put the relevant files up for http access at:
*> http://irricana.cs.ualberta.ca/~weingart/weird.gif
*> http://irricana.cs.ualberta.ca/~weingart/weird.xml
*> http://irricana.cs.ualberta.ca/~weingart/weird.txt
*> The gif is the output of the graph, the xml is a rrdtool dump, and the
*> txt file is a description of how the graph was made.  Any ideas?
*> --Toby.

hmmm this looks rather scary ... 

<!-- 1999-07-28 08:35:00 MDT --> <row><v> 8.5340093594e+02 </v><v>-6.4904567281e+92 </v></row>
<!-- 1999-07-28 08:40:00 MDT --> <row><v>-6.4904574033e+92 </v><v> 3.5346547902e+03 </v></row>

I suspect you are seeing an overflow problem ... your database does not set
either min nor max for the datasouces ... 

the data display routines of rrd_graph prbably click out at about 10e18 ....

it would be interesting to research into why the generated graph looks the
way it does ... anyone ?


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