Nagios Support Forum

Just an FYI, we'll be pushing out the new 2.3 release on Monday.

Thanks for the information.

I installed the update yesterday and it seems to me that the disk rate problems have lessened. We now get a small spike every 2 minutes instead of a huge spike every minute, so cron seems to have been improved (still haven't seen the disk rate go over a 1000 Kb/s). The apache service seems to be using a bit less RAM now and it doesn't grow over time as much as before the update.

There is a small increase in CPU usage, but the bennefits outweigh this problem. I still have to see how the new update works after a week of usage, and how the growth in resource usage will turn out.

I'll keep you updated.

My observations on performance were similar to yours. The spikes seem to flatten out a bit, while the overall disk activity still remains around the same level. Thanks for the updates!

Just one question (off topic)

Is a usage of 1 complete processor (of 2) much for a machine which checks 70 hosts and about 2500 services? The average usage is about 27,5% of 2 processors. (virtual nagios)

There's actually quite a few things that can affect that question. My short answer is yes, that's probably normal. The variables in that are ultimately:

- How many checks are being run every second? ( ( hosts+services / average check interval ) / 60)
- This also depends on the checks that you're running. Compiled plugins take less CPU, while SNMP, ESX checks, and other plugins written in interpreted languages can take more CPU.
- Whether or not mysql is on the same server, or if it's offloaded to a second machine.

The sql database is on the same server and the checks are every 5 minutes.
The only plug-in we use is the ESX perl SDK and the NSClient++ on the servers (about 40 hosts)

This could be about right, however if your CPU usage is 27.5%, that's only about 1/2 of one processor, not 1 complete processor...

The only plug-in we use is the ESX perl SDK

That is actually a pretty big CPU user, so I'd say your system is running pretty nicely ; )

scottwilkerson wrote:This could be about right, however if your CPU usage is 27.5%, that's only about 1/2 of one processor, not 1 complete processor...

This is the average CPU usage. It spikes every 1-2 minutes to about 50% then drops to around 20-22,5%.

We just stopped monitoring every port of our switches (not needed) and now we have about 800 checks and we now have a CPU usage of about 12.5-15% which is good.
Now I just have to solve the problem with the mysql database (in http://support.nagios.com/forum/viewtop ... 3&start=10).

Thanks for the help and you can close the tread now.