Jason Byrns wrote: > Good morning, all. > > I've been tweaking our Nagios install over the years. I've often > wondered exactly how the check_ping plugin reports its results. > > I used to leave this plugin at the default number of packets, which I > believe is five. If and when we saw warnings on packet loss, it would > usually give us numbers like 16%, 32%, or multiples like that. Why not > multiples of 20%, given that it tried five packets? >
This sounds like a bug in check_ping (in order to accurately report 16% packet loss it would have to send at least 6 packets, assuming 16% is rounded value). My guess is that it sends one at startup and then one each second for five seconds, although I can't verify it because I'm too lazy to go look at the code ;-) > Now I'm worried, though. I recently changed our default ping commands > to only use ONE ping packet. This was due to advice I found after a > Google search, when I was seeing extremely high latencies on my host > (and some service) checks. It certainly seemed to help, too, now my > host latency is usually below one second. (Instead of the FIFTEEN > MINUTES it was reporting before that) > > But I still see some reports of packet loss. Like, 50% is a common > number I now see. HOW is it seeing anything but either 0% or 100% > packet loss, if it uses only one packet per host check?? > Assuming 0, 50 and 100 are the *only* numbers you see, this tallies with my guess above. > Also, along those lines... I recently moved from the 1.2 Nagios to the > more recent 2.4-2.5 Nagios. Nagios 1.X seemed to only trigger a host > check if a service check failed. Nagios 2.X seems to ALWAYS run host > checks in addition to service checks. The fact that host checks are > currently not run in parallel seems like this can really limit performance. > > Why did that behavior change? It didn't. Or rather, it wasn't supposed to. I haven't seen anything of the kind in any of our ~160 customers installations, so I'm fairly certain this doesn't happen for all setups. What does your nagios.log report on the ~15 lines prepending the host-check entry? > Will host checks be run in parallel for > the 3.0 series, like I think I read once...? > Yes, that has been planned. -- Andreas Ericsson [EMAIL PROTECTED] OP5 AB www.op5.se Tel: +46 8-230225 Fax: +46 8-230231 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ 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
