High check latency with nagios

[Andreas Ericsson]

If one or more hosts are down, this is more than likely to happpen, as 
Nagios attempts to establish 'down-ness' of hosts before anything else, 
and puts off all other checks while hosts go down (this is to determine 
if service check failures are due to network outages or not). Result; If 
network is 'flimsy' from time to time, Nagios runs into trouble.

I've been meaning to try and work around this, but that requires a 
slight redesign of checking logic, and I'm not about to undertake that 
kind of project without knowing it'll be good enough to get into the 
main source.

marino.simons at acerta.be wrote:
> Hi All,
> 
> We are setting up nagios to monitor our infrastructure, and we ran into a 
> few problems.  Most of them I"ve been able to solve,  thanks to reading 
> the mailinglist.  But the latest problem is a persistent one.
> I'm running nagios on Suse Enterprise server 9, with kernel 2.6.5 on a 
> dual 2.4 ghz intel Xeon server with hyperthreading enabled, the system has 
> 2GB ram.   We recompiled the kernel with SMP-support, en it detects 4 
> cpu's..   In nagios we defined 405 servers, and we do 6855 active checks, 
> and 17 passive checks.   And we have an extremely bad performance. 
> At the tactical overview I see the following information:  check latency: 
> 4468.402 sec.    It takes nagios about 1,5 hour to see a status change. 
> Needless to say that this is not acceptable.
> Anyway I am looking for some hints, does anybode have an idea on what 
> causes this behavior?
> 
> Thanks in advance!!
> Marino

-- 
Sourcerer / Andreas Ericsson
OP5 AB
+46 (0)733 709032
andreas.ericsson at op5.se


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