[rrd-developers] Re: followup on invalid data or spikes

[Tobias Oetiker]

Today you sent me mail regarding [rrd-developers] followup on invalid data...:

*> I am using version 1.0.8 of rrdtool.  I am including the data files I
*> used to reproduce this problem.  Here is the sequence of shell commands I
*> ran:
*> 
*> ./rrdtool create my.rrd -b 946843500 -s 300 "DS:load:GAUGE:300:0:5000" "DS:out_oct:COUNTER:300:0:1250000" "DS:drop_oct:COUNTER:300:0:U" "DS:out_pkts:COUNTER:300:0:25000" "DS:drop_pkts:COUNTER:300:0:U" "RRA:AVERAGE:0.5:1:864" "RRA:AVERAGE:0.5:3:1344" "RRA:AVERAGE:0.5:12:744" "RRA:AVERAGE:0.5:288:91"
*> 
*> foreach i ( `cat file1`)
*>     rrdtool update my.rrd $i
*> end
*> 
*> rrdtool dump my.rrd > db.out
*> rrdtool restore -r db.out my.rrd
*> rrdtool tune my.rrd -a out_oct:1250000 -a out_pkts:25000
*> 
*> foreach i ( `cat file2`)
*>     rrdtool update my.rrd $i
*> end
*> 
*> 
*> Now, examine the rrd at this point, and you will find invalid data:
*> rrdtool dump my.rrd > db.out
*> rrdtool restore -r db.out db.xml
*> 
*> out of range found [ds: 3], [value : 1.9991590274e+37]

Hi Steve,

I just did the moves you described, but it seems that my solaris box works
differently than your computer ... I will run a further test with purify to
see if there are some memory issues ...

However, it might be interesting to see which update is causing the problem,
so if you could try to work on your 'demo' code and try to remove ans many
things from the code as you can so that you still get the error ...

Fewer data values
Fewer RRAs  
Fewer Data Sources

cheers
tobi
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