Files locking might be an issue for scalability?

[Sebastian Ganame]

Hi Marc (& others that answered my question),
    I share your mindset that if using polling 1K instances every 10 seconds (or so) wouldn't make any sense.
      When I post file locking might be an issue, I was not thinking on a pull mechanism for services (Nagios trying to retrieve information), but in Nagios being pushed by services for this kind of info. As far as I read from documentation, for a push schema, the monitored instance has to write a given file inside Nagios structure to update his status.
    What do you think about this?
    Regards,

Sebastian

  -----Original Message-----
 From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of Marc Powell
 Sent: Martes, 10 de Abril de 2007 12:33 p.m.
 To: nagios-users at lists.sourceforge.net
 Subject: Re: [Nagios-users] Files locking might be an issue for scalability?
   
   
   
  > -----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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