A couple of comments: 1. The section on setting up a dual homed network is correct, but misleading. Most people who set up dual-homed networks would expect to spread at least some of the load over the interfaces, but Hadoop code is just not network aware in that sense. So it is *much* better to use bonding/link aggregation for network redundancy. 2. In this day and age, don't even think about using 1Gb ports. Use at least 2 10Gb ports. Cloud providers are *today* installing 50Gb networks to their servers - 2x25Gb or 1x50Gb. You're wasting a LOT of CPU if you don't give them enough bandwidth.
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