We also had to do some tuning with our pnp4nagios for latency. I ended up using a ramdisk for the perfdata folder (that it uses while processing data, not the rrd's) and modified it to run with a nice of 20 to make sure that Nagios always had enough priority to get its work done (which is already running with a nice of -15) and sometimes pnp lags a little but it's still acceptable.
Dan -----Original Message----- From: Pipitone Alan (External) [mailto:alan.pipitone.gu...@saipem.com] Sent: Monday, September 05, 2011 3:33 AM To: Nagios Users List Subject: Re: [Nagios-users] Observing latency Hi All Let me tell you our experience about Nagios service latency. We had about 1000 hosts and 6500 services on one Nagios server. Our service latency was about 600 seconds for each service (!!!). Also, some services were scheduled in the future, three/four days after the regular scheduled check interval (!!!). We read the guide "Tuning Nagios For Maximum Performance" but we couldn't solve the problem. Then (after many tests) we disable pnp4nagios for all services. The latency decreased from 600 seconds to about 15 seconds. This extraordinary result can be explained by the fact that we use pnp4nagios synchronously. Probably our disk (or the controller) couldn't handle the workload (but our tests didn't reveal any details on this critical aspect). Now we have a total of 1200 hosts and 7000 services, we use Merlin to distribuite Nagios between two server and we use pnp4nagios asynchronous. Now our latency is about 0.3 seconds and there are no more services scheduled in the future. I hope this helps. Bye Alan Pipitone http://www.alan-pipitone.com/ -----Original Message----- From: Jim Avery [mailto:j...@jimavery.me.uk] Sent: mercoledì 31 agosto 2011 13:20 To: Nagios Users List Subject: Re: [Nagios-users] Observing latency On 31 August 2011 09:13, trm asn <trm.nag...@gmail.com> wrote: > Please suggest , how I can reduce the latency .. One not-so-obvious thing I found that reduces latency on my heavily-loaded system is to stop and then start the Nagios daemon (don't just do a reload) once a week or so. ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null ****************************************************************************************** CONFIDENTIALITY NOTICE This e-mail and any attachment are confidential and may be privileged or otherwise protected from disclosure. It is solely intended for the person(s) named above. If you are not the intended recipient, any reading, use, disclosure, copying or distribution of all or parts of this e-mail or associated attachments is strictly prohibited. If you are not an intended recipient, please notify the sender immediately by replying to this message or by telephone and delete this e-mail and any attachments permanently from your system. ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
