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It's recommended to have a public network and cluster network when setting up CEPH.

For what I understand this cluster network is what the nodes use to replicate data accross so that would preferably be a 10 gigabit network.

However I read that only the monitor nodes need to be on the public network too. Does that mean that the clients, in my case a Proxmox cluster, connect on the monitor node? That would mean that all the data goes through those nodes, and so that public network would also preferably be 10 gigabit?

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To separate traffic use CEPH synchronization on the private network (10 GB/s NIC). For the monitor and clients, you can use the public network. As for throughput for the public network, it always depends on your performance requirements (use 10GB/s NIC to achieve maximum performance) http://docs.ceph.com/docs/master/rados/configuration/network-config-ref/

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