regular load-spikes on nagiosserver - what's the bottleneck?

[baliu]

Hi,
we figured out that we have regular load-spikes on our nagios server. They seem to occur every 95min but there's no cronjob running in such a shedule. We also don't have a set of checks which is just run every 95min. But nevertheless in exactly this timeperiod the load goes up.

We setup MRTG to watch this (Values are multiplied with 100):

load-day.png (4.46 KiB) Viewed 783 times

This graph isn't showing the exact values because mrtg just takes the data every 5min but sometimes in this spike-time the load can be much higher like 3 or 4.


Our setup:
Quad-Core AMD Opteron(tm) Processor 2356
1 GB Ram
Nagios 3.4.1
hosts: 155
service checks: 527


I think the setup has enough rescources to handle this but nevertheless we have this load-spikes.

Have you any idea what we can look at? How do we get out what each 95min is creating this load?

[slansing]

Do you notice anything out of the ordinary in your Nagios server logs during that spike time frame? Something to indicate that more resources would be needed?