Files locking might be an issue for scalability?

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Sebastian Ganame
> Sent: Tuesday, April 10, 2007 10:13 AM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Files locking might be an issue for
scalability?
> 


>             I know that Nagios is able to do this kind of monitoring,
but
> as far as I understood from the documentation, Nagios saves all cache
and
> status of the monitored environment in text files inside the file
system,
> and I was wondering how scalable would this be when trying to online
> monitor (lets say) 10 services per machine in a 1K machines
environment
> that might update their status every 10 seconds. Do you think
text-files
> locking might be an issue in this case? I cannot found architecture
> details on Nagios that might answer my question, and maybe some of you
can
> give me an insight on this matter.

AFAIK, there is only ever 1 nagios process that writes the status files
at the interval specified by status_update_interval presuming
aggregate_status_updates is enabled, and it should for that many
services. File contention isn't an issue, but how long it takes to
actually write the file might be if you actually want to see
up-to-the-second status information in the web interface.

I personally think you're going to have other scalability issues when
trying to actually perform 10,000 checks every 10 seconds. That's
extremely aggressive IMHO and I believe you'd be breaking new ground.
I'm aware of other installations with that many services but I believe
they're at a more sane check interval of 5 minutes or longer.

--
Marc

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