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It takes a lot of discipline to run a shared power setup like you describe. Most of those servers that have two power supplies operate in a shared power mode, rather than active/failover. This means that if one of your sides (LH/RH) is over 50% and you fail over, you are going to have a cascading failure as the other side goes >100%. It used to surprise me how often I saw things like this, although I'm talking about server rooms in the low 100s of servers, not huge data centers.

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