Hey Paul: But I guess if the odd chance of both the two nodes going down, then your history will be lost...
Of course if you are using Ganglia on a large cluster, you probably don't want every node to be sending packets to each other ;-) Cheers, Bernard > -----Original Message----- > From: Paul Henderson [mailto:[EMAIL PROTECTED] > Sent: Friday, June 04, 2004 10:38 > To: Johnston Michael J Contr AFRL/DES > Cc: Bernard Li; [email protected] > Subject: Re: [Ganglia-general] All my nodes listed as clusters > > What I've been doing is running the gmond on all my cluster > nodes, but making all but 2 of my 160 nodes "deaf" (see > gmond.conf). All the nodes then multicast their information, > but only two hold the data, the other nodes just broadcast > but don't hold any data. > > This is *really* useful, because if one node dies or is > moved, then you don't have to restart gmond on every single > node to get it to 'forget' > the node... you just need to do it on the two listening > nodes. Also, network traffic is significantly reduced. > > Paul > Princeton Plasma Physics Lab > > Johnston Michael J Contr AFRL/DES wrote: > > > Thanks for the response Bernard! > > > > I guess I didn't think that I could only put 1 node in the > data_source > > line because how does it know to go and collect the > information from > > the other nodes? Does it just scan the subnet looking for > any machine > > running gmond? Every one of my nodes has the exact same gmond.conf > > file on it with the name of my cluster in it. Is that how it knows? > > > > Thanks for asking about the graphs... Thanks to everyone's > pointers, I > > learned that I had listed the path to the RRDtool directory, but > > hadn't put the executable name into the path. After I > changed that it > > all started working... ;) Ganglia is really awesome! > > > > Mike > > > > > ---------------------------------------------------------------------- > > -- > > > > *From:* Bernard Li [mailto:[EMAIL PROTECTED] > > *Sent:* Friday, June 04, 2004 11:18 AM > > *To:* Johnston Michael J Contr AFRL/DES; > > [email protected] > > *Subject:* RE: [Ganglia-general] All my nodes listed as clusters > > > > If you only have one cluster, you only need one data_source > (think of > > the data_source as the headnode of your cluster, if you will). > > > > So you just need one entry for data_source - you can put > more than one > > node in the data_source entry for redundancy purposes. > > > > So I take it you can see your graph now and the previous thread you > > posted is dead? > > > > Cheers, > > > > Bernard > > > > > > > ---------------------------------------------------------------------- > > -- > > > > *From:* [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] > *On Behalf Of > > *Johnston Michael J Contr AFRL/DES > > *Sent:* Friday, June 04, 2004 8:37 > > *To:* [email protected] > > *Subject:* [Ganglia-general] All my nodes listed as clusters > > > > I have a silly question, as usual... > > > > When I bring up the view of my cluster, it comes up as > a Grid... so > > it .looks like this: > > > > Grid > MyCluster > Choose a Node > > > > I'm guessing that's because in my gmetad.conf file I have every > > node in my cluster listed as: > > > > data_source "N1" 60 192.168.3.2:8649 > > > > data_source "N2" 60 192.168.3.3:8649 > > > > I'm sure that I'm listing them wrong because Ganglia thinks that > > each node is its own cluster. My question is how do I make them > > appear like one unit as I see in the demo pages? Do I > add them all > > to one data_source line? > > > > On a side question, is it normal for my head node to > always be in > > the red? It looks like it's only using about 8% CPU, but it's > > always red or orange. > > > > >
