Tobias Klausmann wrote: > Hi! > > On Tue, 27 May 2008, Hugo van der Kooij wrote: >>> Unfortunately, Nagios connects multiple parent hosts with >>> logical AND, which means that the host only turns UNREACHABLE >>> when *both* switches are gone. >> The funny thing with redundant paths is that they are in fact >> redundant. So if you loose one you still have connectivity and >> nothing becomes unreachable. >> >> So where is the flaw in this design in Nagios? If breaking a >> single link ~ will result in something becoming unreachable >> then you do not have true redundancy. > > Oh, the machines themselves aren't connected redundantly, only > the switches themselves are. Usually the second link is used for > connections to database machines and the like. As such, if either > links goes down, the machine goes down (from a can-do-its-job > perspective). Yes, I can still reach the machine (on convoluted > paths since the backend nets are not routed). > > What I'm after is making a failing switch visible to the admins > of such machines (and ideally everybody else), so I'm aiming for > the distinction of DOWN vs. UNREACHABLE. >
Would you settle for DOWN vs CRITICAL? If so, monitor the secondary interface as a service. > I don't really want to make all the switches visible to all > admins via the web interface (and I doubt they all are able to > tell which switch is "theirs" just by the names). > > I don't see this behaviour as a *flaw* in Nagios, it's just > unfortunate for me that it works this way and I had hoped there > was a way around it. > There is. Either add the switches twice, calling the switches added with their secondary interface, <switch-name>-srvint (or some such - I'm thinking "admin interface" and "service interface" here), or add the secondary interface as a service. -- Andreas Ericsson [EMAIL PROTECTED] OP5 AB www.op5.se Tel: +46 8-230225 Fax: +46 8-230231 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ 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
