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May 2003 Power supply installation
Part 2: 1001rp Server Hardware Installation 47
-48VDC power distribution rationale
Minimum installation is one Power Distribution Unit (PDU) with four
48VDC branch circuits fused at 20 amperes.
The customer must be able to shut off any branch, and every unit at the
site will continue to function properly.
DC-powered configuration fits into this scheme as follows:
Each PDU receives four branch circuits.
Each server receives a feed from each PDU and a different branch
circuit.
In this fashion, with dual hot-swappable power supplies, there is no
single point of failure in the power system. For example, you can remove
any power supply, including a PDU, and everything continues to work.
This is applicable to either North American or European installation sites
(with a 230 VAC Inverter).
The secondary rack supports four servers and follows a similar scheme.