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Leaving the clarity and findability of the documented answer aside, does anyone know the actual answer to the original question? We have a cluster with about twenty gmond nodes and one gmetad host. host_dmax is set to 3600. Hosts that die never just disappear from the set of graphs. We go through a nondeterministic procedure of restarting all of the gmonds over and over again, and eventually the dead graphs disappear and the gmonds begin reporting again. But I haven't been able to pin down exactly which restart actually removes them, or why restarting a gmond usually makes it stop reporting. The readme says "ALL dead hosts will be flushed from the record by restarting the processes" but it seems there is more to it than that. It seems they have to be restarted in a certain order, but we haven't figured out what that order is. Googling for this answer, I find a lot of folks asking it, and some other folks telling them to read the whole FAQ or the entire wiki, as if they hadn't tried that already. I also found some advice to shut the whole thing down, and then bring it all back up again. That's close, but we have to do it multiple times, and can't figure out why. Maybe someone who understands ganglia internals can explain it. -Cameron Vladimir Vuksan wrote: I second Martin's request. This has been an ongoing issue so we ought to simply change the default to e.g. 30 seconds or so. We can put in a comment in the config file that if you are in multicast environment you may want to set this to 0.What's the downside of setting it != 0 ? A bit more network traffic ? Anyways I think we should shoot for sensible defaults that work for most people. On Thu, 18 Nov 2010 02:44:13 -0800 (PST), Martin Knoblauch <[email protected]> wrote: This email message is for the sole use of the intended recipient(s) and may
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