>I think I'm a little confused on this... Does each gmetad list the other
>gmetad's as data_sources?

Yes, you build a tree with multiple gmetad/web configs.  You need a gmetad 
process for each branch in your tree.

Let's say I have clusters foo, bar and baz at several sites.  Each site then 
runs a gmetad to rollup the site:

gridname "SiteA"
authority "http://ganglia.siteA.foo.com";
data_source "foo" [foo sources]
data_source "bar" [bar sources]
data_source "baz" [baz sources]

SiteB is similar.  Then they both run another gmetad for global rollup:

gridname "global"
authority "http://ganglia.siteA.foo.com/global";
data_source "SiteA" 15 ganglia.siteA.foo.com:port
data_source "SiteB" 15 ganglia.siteB.foo.com:port

Each gmetad also needs unique port numbers and rrd_rootdir.  I put all my 
rrd_rootdir at /var/lib/ganglia/rrds/<gridname>.  Finally the web server needs 
a copy of the PHP at the given authority URLs, with conf.php pointing to the 
right RRDs and ports.

-twitham


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