Scheduled checks falling far behind

[Jonathan Angliss]

On 10/22/10 19:29, Litwin, Matthew wrote:
> I have been chasing my tail trying to figure out why my RRD files were
> very sparsely populated, and I am realizing that my checks are falling
> behind of their scheduled times up to 3 times their set check interval.
> For example a service that should be checking every 5 minutes. In the
> example below, the time is 00:19:02, the last check was 00:10:30 and the
> next scheduled check time is 00:13:28. This means it is almost 6 minutes
> behind schedule and almost 9 minutes since the last check!

> I find even if I shorten the check interval to say 3 minutes it still
> behaves about the same. The server has very low load and nagios is
> hardly working at all. (usually below 4% cpu) I haven't touch any of the
> tuning on this and from what I have read the default settings appear
> unthrottled. Is there any way to make it "work harder"?


> --Service information--
> Last Updated: Sat Oct 23 00:19:02 UTC 2010
>
> --Service State Information--
> Current Status:	
>    OK
>   (for 7d 16h 14m 46s)
> Status Information:	CPU STATISTICS OK : user=0.12% system=0.00% iowait=0.00% idle=99.88%
> Performance Data:	0.12;0.00;0.00;99.88;80;90
> Current Attempt:	1/3  (HARD state)
>>>> Last Check Time:	10-23-2010 00:10:30<<<<
> Check Type:	ACTIVE
> Check Latency / Duration:	612.633 / 2.052 seconds

This check latency is terribly high.  What is your overall latency look 
like on the tactical overview page?  How many hosts and services are you 
checking?

The doc on tuning has some hints on tweaking some settings that improve 
these numbers, worth a quick read...

   http://nagios.sourceforge.net/docs/3_0/tuning.html

-- 
Jonathan Angliss


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