Betr.: RE: High check latency with nagios

[Cook, Garry]

I currently monitor about 200 hosts and 700 services. However, in the
past I have monitored 500 hosts and 2500 services with no issues on a
PIII 866Mhz box.
 
Changing the number of simultaneous checks as suggested by Nagios is a
good start. However, there are several other parameters that you may
want to look at, as described in these docs:
http://nagios.sourceforge.net/docs/1_0/checkscheduling.html
There is probably additional information relevant to your issue in the
docs and/or FAQ, do a little digging.
 
You may also want to look into distributed monitoring.  
 
When responding, please email the list, and not only to me. I don't have
all the answers and there are people out there with more knowledge than
I that may be able to offer further assistance. Also, it's a good idea
to have these threads in the archives, so that maybe it will help
someone else in the future.

Garry W. Cook, CCNA
Network Infrastructure Manager
MACTEC, Inc. - http://www.mactec.com/
303.308.6228 (Office) - 720.220.1862 (Mobile) 

-----Original Message-----
From: marino.simons at acerta.be [mailto:marino.simons at acerta.be] 
Sent: Wednesday, May 26, 2004 1:47 AM
To: Cook, Garry
Subject: Betr.: RE: [Nagios-users] High check latency with nagios



Hi, 
Thanks for your advice, but I've already tried this,   nagios suggests
560 simultanous checks, I changed this value in nagios.cfg, but it
doesn't make any difference...   For some reason the entire system bogs
down. 
Anyway I am planning to remove 80% of the hosts from nagios,  and then I
hope to see some improvement.. 
Just to have an idea about the size of my nagios setup,  how many
hosts/services do you monitor with nagios? 

Thanks&regards, 
Marino Simons 
Acerta ICT, Network Administrator 
Tel: 016246776 





	"Cook, Garry" <GWCOOK at mactec.com> 


24/05/2004 22:12 


        
        Aan:        <marino.simons at acerta.be> 
        cc:         
        Onderwerp:        RE: [Nagios-users] High check latency with
nagios



Run Nagios with the help parameter '-h'. This will give you a
description of a few other parameters that can be run. I think the one
you will be interested in is '-s', which analyzes your check scheduling
information and makes suggestions for improvement. You'll probably need
to run the command like so: 
  
/path/to/nagios/bin/nagios -s /path/to/nagios/etc/nagios.cfg 
  
HTH 

Garry W. Cook, CCNA
Network Infrastructure Manager
MACTEC, Inc. -  <http://www.mactec.com/> http://www.mactec.com/
303.308.6228 (Office) - 720.220.1862 (Mobile) 


-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of
marino.simons at acerta.be
Sent: Monday, May 24, 2004 12:59 AM
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] High check latency with nagios


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 



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