This may seem like a basic question, but it came up during a rework of our server room. All but two of our servers have dual power supplies. We have only a couple of circuits powering the room, and all feed from the same power source, municipal power. Assuming that the UPS units can handle the loads, is it best practice to have each power supply in a server fed from a different UPS? Thanks.
yes, for redundancy you should put each power supply on a separate circuit so if the circuit goes down, you still have a chance of having one circuit up.
also, for maximum redundancy, APC makes ATS units - whether its large three phase units or a Rack ATS (http://www.apc.com/products/family/index.cfm?id=14).
you might want to consider a few UPS units to input to the ATS which can automatically switch between sources when there are power issues and essentially give you redundant power. for ideal redundancy each ATS input source should be connected to an UPS on a separate circuit but if you only get one UPS for your other circuit, you can input both sources from that to the ATS but it does create a single point of failure if something happens to that UPS.
here is a Rack ATS technical brochure -> http://www.apcmedia.com/salestools/THON-7GTPY6_R5_EN.pdf
you can maybe take a look there and see what you think is best for your environment.
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