Dear colleagues, at the moment, we use Ceph in routed environment (OSPF, ECMP) and everything is ok, reliability is high and there is nothing to complain about. But for hardware reasons (to be more precise - RDMA offload), we are faced with the need to operate Ceph directly on physical interfaces.
According to documentation, "We generally recommend that dual-NIC systems either be configured with two IPs on the same network, or bonded." Q1: Did anybody test and can explain, how Ceph will behave in first scenario (two IPs on the same network)? I think this configuration require just one statement in 'public network' (where both interfaces reside)? How it will distribute traffic between links, how it will detect link failures and how it will switchover? Q2: Did anybody test a bit another scenario - both NICs have addresses in different networks and Ceph configuration contain two 'public networks'? Questions are same - how Ceph distributes traffic between links and how it recovers from link failures? Thank you. -- Volodymyr Litovka "Vision without Execution is Hallucination." -- Thomas Edison
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