Hi Rob, Further to this discussion - I've removed the check_interval directive (or rather set it to 0) for all hosts. I've added a Ping service to each host called "OVERALL SERVER AVAILABILITY", and set it to check every minute (where all other services are every 5 minutes).
Nagios however is still checking each host roughly every 2 minutes, regardless. Even on the 2 routers, where the Ping service has had 100% uptime all day, Nagios has been checking the host roughly every 1-2 minutes. I have completely killed off all Nagios processes, verified the config (which removed the 2 warnings for the service-less routers), and started it up again. So it seems to me that it doesn't really make much of a difference? Andy. Sloane, Robert Raymond wrote: >> JOOI, why is it said that a host check degrades performance? >> > > As Giles Coochey mentioned earlier, host checks may cause performance > problems because they are not scheduled in the same way as service > checks. To quote the documentation again: > > Also of note - when Nagios is check the status of a host, it holds off > on doing anything else (executing new service checks, processing other > service check results, etc). This can slow things down a bit and cause > pending service checks to be delayed for a while, but it is necessary to > determine the status of the host before Nagios can take any further > action on the service(s) that are having problems. > > If your system can handle the overhead of running host checks every > minute, that is fine, but I think people should be aware of the possible > consequences of running "service-less" hosts. As for me, I just add a > PING service to any host that doesn't have any other services. It does > what you want, in that it can be scheduled to run every minute, but it > doesn't slow down other processing. > ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Nagios-users mailing list [email protected] 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
