Performance tuning a host returning results via NSCA

[Marc Powell]

On Mar 6, 2008, at 8:17 PM, Oliver Hookins wrote:

> Hi all,
>
> I guess performance is a constant problem for everyone but what I'm  
> seeing
> doesn't seem to make sense. I have two servers running Nagios, one  
> that is
> more or less just a frontend and another doing the checks and  
> returning
> results via send_nsca. Constantly I see the frontend light up with  
> criticals
> due to the passive results not being received in time (the service
> freshness timeout is 120 seconds).

How many and are they always the same? What version of nagios?
>
>
> I only have 120 passive service checks and 45 passive host checks,  
> so I can
> assume if none of the hosts are down it is only doing one check per  
> second.

Nagios doesn't distribute them that evenly but it tries to. I assume  
that you haven't done anything to prevent the parallelization of  
service checks. Is your normal_check_interval exactly 120 seconds? If  
so, you'll have some checks that happen at that time and their results  
would be received by the central host after your freshness timeout.  
Also, do you have a lot of host volatility?

I'd also check communication between the remote and central. Try  
sending passive results manually from the command line to make sure  
they complete in a timely manner (should be fractions of a second).

--
Marc

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