[smokeping-users] Curl Graphs blank?

Peter Kristolaitis alter3d at alter3d.ca
Wed Sep 12 17:50:44 CEST 2007

Hi Pete;

When an RRD graph is blank, it means null/no data (meaning no data at 
all was entered, like a NULL in a database, rather than a zero). With 
SmokePing, typically this would occur if the daemon was turned off 
during that time period, or e.g. if the probe crashed.  One other 
possible cause would be if SmokePing is not able to complete all probes 
within the allotted cycle time (e.g. if it takes 330 seconds to run all 
of the probes, but you are on a 300 second scan cycle, then some hosts 
will get missed).  Check your SmokePing log files to see what's going on 
-- it will warn you if cycles are overlapping.

The other thing to do is correlate the information against something 
else.  For example, if you're monitoring servers and there is a blank 
spot in SmokePing, did the server actually go down during that time?  
Are there helpdesk tickets for that system in that timeframe?   If the 
server WAS down but the SmokePing graphs are blank, it could be a bug in 
the Curl probe.  If the servers were up at those times, it's more likely 
the problem described in my first paragraph.

- Peter

Pete Hoffswell wrote:
> Good day!
> I have been encountering blank sections within trending charts on some 
> CURL probes.  I would have expected them to go red, if there was no 
> response.
> What does this mean? I cannot find in the documentation or searching 
> the list.
> I've posted a representative graph here:
> http://www.flickr.com/photos/petehoffswell/1366734130/
> Anyone know why this happens? 
> Pete Hoffswell                 616-732-1101 (x1101)
> Network Manager                616-510-1198 (Mobile)
> IT Services                    pete.hoffswell at davenport.edu 
> <mailto:pete.hoffswell at davenport.edu>
> Davenport University           http://www.davenport.edu 
> <http://www.davenport.edu/>
> http://www.youtube.com/watch?v=jyV_zLKth3I
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