How many passive service check results per second ?

[Marc Powell]

> -----Original Message-----
> From: Verstege, Bernhard [mailto:Bernhard.Verstege at iwr.fzk.de]
> Sent: Friday, November 14, 2003 11:12 AM
> To: NAGIOS
> 
> Hi,
> 
> we have set up Nagios with ditributed monitoring.
> The Nagios-Master gets only passive service check results
> fron the distributed monitors (about 8000 per hour)
> and does not run any eventhandler.
> 
> We see a lot of failed send-nsca commands on the disributed monitors
> and the external command file at the master is most of the time
> nearly 4k big (is this the maximum for a FIFO-stack ?)
> 
> Setting the command check interval to 2s results in an increasing
> number of nagios processes, but the external command file becomes
> only 1.5k big and most send-nsca are successful.
> 
> What is the maximum number of passive service check results nagios
> can handle ? It is running on a dual PII 1,26Ghz with 1GB RAM.

I believe that someone did some type of calculation for this last year.
For what it's worth, I have 2559 services at 5 minute intervals (all
passive using 4 data collectors reporting all checks to 2 centralized
host for duplication) which equates to about 31,000 per hour and nagios
doesn't even break a sweat. It's currently running on a quad P3 500mhz
with a gig of ram but nagios rarely uses significant resources on the
box and I've had it running on lesser boxen.

Passive Checks: Time Frame Checks Completed 
<= 1 minute: 219 (8.6%) 
<= 5 minutes: 2545 (99.5%) 
<= 15 minutes: 2559 (100.0%) 
<= 1 hour: 2559 (100.0%) 
Since program start:   2559 (100.0%) 
 

You don't say how often you are checking your services and that will
have a _big_ impact on nagios performance. If I were doing the same
checks above at 1 minute intervals I'd probably be killing nagios. Some
of my pertinent nagios.cfg settings are below --

service_reaper_frequency=5
retention_update_interval=5
aggregate_status_updates=1
command_check_interval=-1


--
Marc


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