----- Original Message ---- > From: David Birdsong <[email protected]> > To: Whit Blauvelt <[email protected]> > Cc: Martin Knoblauch <[email protected]>; >[email protected] > Sent: Fri, November 12, 2010 9:56:26 PM > Subject: Re: [Ganglia-general] How can gmetad be configured for 2 clusters? > > On Fri, Nov 12, 2010 at 9:19 AM, Whit Blauvelt <[email protected]> wrote: > > On Fri, Nov 12, 2010 at 08:35:44AM -0800, Martin Knoblauch wrote: > > > >> In order to separate the two clusters, they need to run on different >ports. > >> > >> In addition: when you list more than one node on the data_source, this >does not > >> define the cluster. I just adds failover capability. "gmetad" will only >talk to > >> one of the hosts at a time. If that fails, it will try the next on the >list. > > > > Thanks Martin. That was the whole trick. I was making the assumption that > > gmetad, being "meta," would be the gatherer of data from the nodes. > > Understanding that the gmonds go ahead and consolidate that changes the > > picture entirely. As my five-year-old sometimes says, "Silly me." > > > > Whit > > > While I can't argue against something that clearly fixed this for you, > this doesn't sound correct and it would be nice to hear this > clarified. > > Sure every host would have info about every other host, but each > host's xml tree should have all the nodes in a nested in their > corresponding cluster tags. Gmetad could hit any host and pick up > info about both clusters on any host, but it should know to distribute > the updates from the xml stream to the correct clusters and not 'cross > pollinate' the two. >
As far as I know, every gmond just puts all the information it has inside its own "cluster" tags. It does not care about the cluster tags it receives from other gmonds. It has always been the task of gmetad to build up the correct XML for the complete grid. Therefore it is vital that the gmond configuration for multiple clusters is "correct". One could argue that this behaviour of "gmond" needs improvement. One solution could be that it aggregates only data coming from the "cluster". On the other hand, the "cluster" tag is just optional. What should a gmond without such a tag do about data from tagged gmonds? I still favor correct configuration. In any case, I am adding ganglia developers to CC. But the confusion shows, that documentation might be lacking ... Cheers Martin ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
