On 07/25/2013 07:37 PM, Nikhil wrote: > gmond aggregator is the node which has all the metrics (all the > gmond instances send the metrics to this gmond node), it need not be > restarted every time a reporting node(clients) are added/removed. The > problem happens when the aggregator node goes down; clients will not > be able to send the metrics then, so the choice would be to configure > multiple aggregators(lets say 2) and have them listed in > udp_send_channels of gmond configuration of every node. This means > all gmond clients will be sending the metrics simultaneously to both > the aggregators. Looking around got me got this links for better > explanation with pictures. > > http://books.google.co.in/books?id=X9haRQi85hkC&lpg=PA21&ots=n531RMIaSr&dq=ganglia%20unicast%20topology&pg=PA22#v=onepage&q=ganglia%20unicast%20topology&f=false thanks for info! I just ordered locally this book :)
> These aggregators can then be used as source for metric data by > gmetad.conf. Since both nodeA and nodeB both have the same view of > the entire cluster metric, they would serve each other as a backup > copy. > > for example: data_source clusterC nodeAipaddress:<gmondport> > nodeBipaddress:<gmondport> > > gmetad always tries to connect only one node at a time and polls for > the metric data on tcp. If nodeAipaddress goes down or is not > reachable, gmetad will try the next node in the series that is nodeB, > for redundancy. k great! > You may want to read this thread also to get an idea for you to > consider the unicast topology you want to consider > > http://www.mail-archive.com/ganglia-general@lists.sourceforge.net/msg07265.html interesting mail (too bad that it didn't got an answer) At this point i am thinking to have a layers of aggregators (at the edge of clusters).. i would make the cluster gmonds (usually the gmonds on the torque and slurm servers) to join another multicast address than the one used inside the clusters together with 1 or 2 central gmonds (as datasurces to gmetad) to create a separate layer of traffic. I have only 100+ servers and in the near future i will not go over 200.. Could the mcast chatter be a problem for the network? gmond estimate a bandwidth of 60 bytes/s per node and i have 3 clusters and a few separate nodes .. i would estimate in the upper gmond layer an chatter at the level of tens of k... Is this workable and efficient? Thanks a lot for your help! Adrian
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