[smokeping-users] Gaps in Graphs

Peter Kristolaitis alter3d at alter3d.ca
Mon Nov 12 20:58:40 CET 2007

Hi Scott;

The first thing I would check would be to see if any new devices have 
been added to your SmokePing config around the time you started having 
problems.  If so, check the SmokePing logs for warnings that look like 
"Warning:  Polling took longer than the interval step." or something 

What could be happening is that at some point, you had X devices 
monitored, and they took, for example, 298 seconds to scan.  If you 
added another device, all of a sudden it might take 302 seconds to 
scan.  If you had your scan cycles set to 5 minutes (300 seconds), this 
means that SmokePing can't complete a round of scanning before another 
one starts.  This could definitely cause the problems you've been seeing.

If this is the case, the solution is to either lenghten the scan cycle, 
remove some hosts, increase concurrency (although I don't think that's 
supported in 1.x?), or upgrade to the current SmokePing series and 
implement multiple monitors and/or master/slave.


Scott Moseman wrote:
> We're running Smokeping 1.34.  Yes, I'm aware its old, but it's been
> deployed forever and it's been working fine.  Lately we've been having
> some weird issues with missed polls.  I have attached a sample showing
> the last 3 hours and it includes 3 missed holes.  This happens across
> every device in the Smokeping config.  We have a script that runs
> every 5 minutes to update the config if there's new entries and part
> of that process is to verify the process is running (and restart, or
> start, if necessary).  It logs what's going on.  When the config
> updates and Smokeping restarts, there's never a gap.  According to my
> scripts, and looking at the age of the Smokeping process that's
> running, these gaps were NOT caused by Smokeping having failed
> execution.  Also, I setup a ping tool to monitor the switch, router
> and an external address every SECOND for awhile.  There was never a
> lack of connectivity during these gaps in Smokeping.  Is there any
> means to troubleshoot?  I will enable the syslog function to see if it
> provides any details about what's going on.
> Thanks,
> Scott
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