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Apologize for my inexperience or if I am missing something important here...

Everyone kept talking about how good it is to have redundant power supply in servers, yet no one talks about a redundant power supply's distributor failing.

Correct me if I am wrong, redundant power supply consists of 3 major parts, 2x power supply units and a power distributor. Does the central power distributor never fail? Or am I missing something here?

Edit for more clarification: The Power Distributor as in the unit that you plug the redundant power supply unit's golden finger in.

https://i.stack.imgur.com/breLv.jpg

Jerng Yue
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  • Power Distribution Unit (PDU). Yes, they can fail. That's why it's also a good idea to have redundant PDU's, each from a separate mains/generator supply if possible. – Greg Askew Jan 02 '23 at 20:54
  • Hey Greg, I am referring to the unit that the golden finger plugs in. Not the power supply unit itself. – Jerng Yue Jan 02 '23 at 21:10
  • What exactly is the "golden finger"? – joeqwerty Jan 02 '23 at 21:25
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    Redundant PSU's isn't about PSU's failing either; it's about power *input* failing. Two PSUs means you can replace an UPS without downtime. – vidarlo Jan 02 '23 at 21:26
  • @vidarlo Indeed, at least not limited to the scenario of that a PSU in itself fails. – Håkan Lindqvist Jan 02 '23 at 21:33
  • @vidarlo Thank you for your input, I am aware of that, people mentions this a lot . I am just wondering why no one talks about this exact unit (Power Distributor), do they fail or it is just some kind of wire passing through from the PSU unit which makes it almost impossible to fail? There has to be some kind of switching going on isn't it? There is also a buzzer that is connected to this that makes sound when one PSU fails... – Jerng Yue Jan 02 '23 at 22:10
  • and this is also one of those parts that I believe is very hard to find a part replacement for when it fails – Jerng Yue Jan 02 '23 at 22:16
  • Depending what a PDU is for you - a low function PDU is basically an extension cord of some sort with multiple plugs. Metered contain meter circuits for every plug, switched can be switched on and off. – TomTom Jan 03 '23 at 10:02

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Yes, you are missing something - that a professional setup does not have a central PDU but 2 PDU that are fed from 2 separate power lines, have 2 different USV's and generator clusters in case that fails.

TomTom
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