benchmark question

[Dario B. Bestetti (OpServices)]

----- "Patrick Morris" <patrick.morris at hp.com> escreveu:

> shadih rahman wrote:
> > List,
> >    Is there any information as to what is the maximum number of 
> > services one can run on a single box with single instance of Nagios?
>  
> > I did not find any concrete data on this.
> >
> > I am running a single instance of nagios on a quad core 2.5 GHZ 
> > machine with with 4 Gigs of RAM. 
> >
> > I have total of 7359 service check running on this box.  I have also
> 
> > ndoutils running on the same box as backend. 
> >
> > My total service checks is going to five fold very soon with a lot
> of 
> > nrpe checks. 
> >
> > Now, my question is should I run multiple instance of nagios on the
> 
> > same box or a single instance will be able to handle about 30000 
> > service checks?
> 
> In my experience, you'll run into issues right around 8,000 checks or
> 
> so, depending no output verbosity, on a fairly stock setup. This is
> due 
> to the size of the pipe used to temporarily store check results, at 
> least on Linux (and you may be seeing it already with your number of 
> checks). Around that point, even with quite a bit of tuning, the check
> 
> results will fill the pipe in less than a second, which is the minimum
> 
> amount of time I've been able to configure Nagios to flush it. When
> that 
> happens, latencies go through the roof.
> 
> Distributing the checks doesn't solve the problem if you're still 
> sending the results to a centralized Nagios instance, since one
> machine 
> still needs to process all of them.
> 
> I'm working through this situation now, and it's looking like it may 
> take a custom kernel with a larger pipe size to handle
> it.
> 
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Shadih, we have a customer running over 20.000 service checks in a single box. 

The box is 2x Intel Dual-core Xeon 3Ghz with 8Gb RAM. The latency is around 0.7s. The checks are performed between 3min and 5min. They have around 40 simultaneous users. 

_________________________________________________
Dario B. Bestetti        OpServices
                                  R. Luciana de Abreu, 471 - Sala 403
                                  Porto Alegre, RS - CEP 90570-060
Fone 55(51)32753588 Mobile  55(51)81518218
Fax     55(51)32753588  Email    dario.bestetti at opservices.com.br
 
               "In God we trust, the rest we monitor ..."
_________________________________________________


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