Load issues with Nagios

[Carroll, Jim P [Contractor]]

I don't suppose you've run 'top' at all...?

jc

> -----Original Message-----
> From: Ken Snider [mailto:ksnider at datawire.net]
> Sent: Monday, January 27, 2003 8:13 PM
> To: nagios-users at sourceforge.net
> Subject: [Nagios-users] Load issues with Nagios
> 
> 
> Greetings all,
> 
> We have Nagios running, about 50 servers, 250 processes 
> monitored. The vast 
> majority of these checks are via nsca/send_nsca, with the 
> only active checks 
> being host-checks, and ping checks. nsca is running via Xinetd, 
> command_check_interval is -1, reaper frequency is 5, and 
> everything works 
> reasonably well. Services are configured to check in every 2 minutes.
> 
> My issue is, the box is *always* at 100% CPU. At first, I 
> figured this was 
> related to the 50 or so send_nsca connections (and subsequent 
> dumps to 
> Nagios' pipe) that occur every two minutes via nsca. However 
> these are dealt 
> with within 20 or so seconds, leaving about a minute and a 
> half where all 
> Nagios is really doing is pinging.. yet the CPU usage remains.
> 
> My next thought was the command_check_interval being -1. 
> setting it to 1 had 
> no difference.
> 
> I tried raising the reaper interval to 10 seconds as well, no 
> difference. I 
> lowered the max_concurrent_checks to 40, no change. 
> consistently 100% use.
> 
> Set the status_update interval to 30 seconds, to make sure it 
> wasn't the 
> writes to the status file, nothing (yep, aggregate writes is on).
> 
> The system, BTW, is RH8, PIII-750, with 256 MB RAM and a Gig 
> of Swap. The 
> box is using a whopping 60MB of ram. The box almost never 
> uses IO (save the 
> mad rush every two minutes from NSCA), and has nothing else 
> of import (or 
> load) running. Load is all from the parent nagios process.
> 
> So, here's my question.. is this load, perhaps, *normal*? Is 
> a P-III 750 
> really, truly maxed out with about 50 active services (ping 
> mainly), and 300 
> passive services running?
> 
> I personally find that difficult to believe, but I like to 
> hear everyone's 
> thoughts on the subject. ;)
> 
> Thanks in advance. :)
> 
> -- 
> Ken Snider
> Senior Systems Administrator
> Datawire Communication Networks Inc.
> 
> 
> 
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