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...d clients" This configuration includes 2 additional "fake" o2ib networks to work around lustre''s simplistic NID selection algorithm. It connects "even" clients to "even" servers with o2ib0 on rail0 and to "odd" servers with o2ib3 on rail1. Similarly it connects "odd" clients to "odd" servers with o2ib1 on rail0 and to "even" servers with o2ib2 on rail1. Hope this demystifies things :) Cheers, Eric