IBM 8668 - Eserver xSeries 232, Hardware Maintenance Manual

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4. Install a replacement power supply.
5.
Plug the power cord for the power supply into the power cord connector. Then,
plug other end of the cord into a properly grounded outlet.
6. Verify that the ac power light and dc power light are lit, indicating that the
power supply is operating correctly.
7. If you turned the server off in step 1a on page 69, turn on the server and
peripheral devices.
Installing redundant power supply
You can build a fault-tolerant power system by upgrading to a power-sharing
backplane. The power-sharing backplane replaces the standard power backplane
and allows you to use up to three 250-watt hot-swap power supplies for power
sharing. You can maintain a redundant configuration with two power supplies,
which allows the system to continue operation even if one power supply fails.
Implementing a third power supply ensures redundancy even if one power supply
fails. The backplane will alert you when redundancy is lost with the two or three
power supplies configuration.
Removing a power supply
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Hardware Maintenance Manual: Type 8668