{"action":"closed","issue":{"url":"https://api.github.com/repos/chrislusf/seaweedfs/issues/553","repository_url":"https://api.github.com/repos/chrislusf/seaweedfs","labels_url":"https://api.github.com/repos/chrislusf/seaweedfs/issues/553/labels{/name}","comments_url":"https://api.github.com/repos/chrislusf/seaweedfs/issues/553/comments","events_url":"https://api.github.com/repos/chrislusf/seaweedfs/issues/553/events","html_url":"https://github.com/chrislusf/seaweedfs/issues/553","id":253326845,"number":553,"title":"why there is no machine node in topology?","user":{"login":"rockiee281","id":1115151,"avatar_url":"https://avatars1.githubusercontent.com/u/1115151?v=4","gravatar_id":"","url":"https://api.github.com/users/rockiee281","html_url":"https://github.com/rockiee281","followers_url":"https://api.github.com/users/rockiee281/followers","following_url":"https://api.github.com/users/rockiee281/following{/other_user}","gists_url":"https://api.github.com/users/rockiee281/gists{/gist_id}","starred_url":"https://api.github.com/users/rockiee281/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rockiee281/subscriptions","organizations_url":"https://api.github.com/users/rockiee281/orgs","repos_url":"https://api.github.com/users/rockiee281/repos","events_url":"https://api.github.com/users/rockiee281/events{/privacy}","received_events_url":"https://api.github.com/users/rockiee281/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2017-08-28T13:20:10Z","updated_at":"2017-08-29T04:02:24Z","closed_at":"2017-08-29T04:02:24Z","body":"Hi, in order to use multi disk on my machine, I need to start several datanode on single machine, but I find there is only datacenter/rack/datanode 3 level in the topology. If I want to my master/replication volume allocated on different physical machine, I have to define different rack for them, and different datacenter for my racks. This seems to be strange, I wander is there some design in weed-fs to prevent master/replication volume be allocated to different datanode on  one physical machine ? Will `001` spread master/replication volume to different machine, judge by IP  address"}}
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