Re: running two rings on the same subnet

[Hontvári József Levente]

You have to use PropertyFileSnitch and NetworkTopologyStrategy to create a multi-datacenter setup with two circles. You can start reading from this page: http://www.datastax.com/docs/1.0/cluster_architecture/replication#about-replica-placement-strategy Moreover all tokens must be unique (even across datacenters), although - from pure curiosity - I wonder what is the rationale behind this. By the way, can someone enlighten me about the first line in the output of the nodetool. Obviously it contains a token, but nothing else. It seems like a formatting glitch, but maybe it has a role. On 2012.03.05. 11:06, Tamar Fraenkel wrote: Hi! I have a Cassandra  cluster with two nodes nodetool ring -h localhost Address         DC          Rack        Status State   Load            Owns    Token                                                                                85070591730234615865843651857942052864 10.0.0.19       datacenter1 rack1       Up     Normal  488.74 KB       50.00%  0 10.0.0.28       datacenter1 rack1       Up     Normal  504.63 KB       50.00%  85070591730234615865843651857942052864 I want to create a second ring with the same name but two different nodes. using tokengentool I get the same tokens as they are affected from the number of nodes in a ring. My question is like this: Lets say I create two new VMs, with IPs: 10.0.0.31 and 10.0.0.11 In 10.0.0.31 cassandra.yaml I will set initial_token: 0 seeds: "10.0.0.31" listen_address: 10.0.0.31 rpc_address: 0.0.0.0 In 10.0.0.11 cassandra.yaml I will set initial_token: 85070591730234615865843651857942052864 seeds: "10.0.0.31" listen_address: 10.0.0.11 rpc_address: 0.0.0.0  Would the rings be separate? Thanks, Tamar Fraenkel  Senior Software Engineer, TOK Media  ta...@tok-media.com Tel:   +972 2 6409736  Mob:  +972 54 8356490  Fax:   +972 2 5612956