Power Supply Redundancy

The Xserve supports up to two power supply modules for redundancy. There are two power supply bays in the rear of the Xserve's enclosure. You can replace or install a power supply from the back panel without removing the Xserve from the rack. If the Xserve has two power supplies, they are hot-swappable; the Xserve will continue to operate using only one supply while the second is removed. For more information about removing or installing power supply modules, see "Power Supply" in the Take Apart chapter.

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Power Supply Bay 1

Power Supply Bay 2

Power Supply Bay 1

Power Supply Bay 2

Power Supply Status LED

The power supply status LED is located above the AC power connector on each power supply. This LED will illuminate either green or red to indicate status.

Power Supply Status Light

Power Supply Status Light

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If the Xserve is already running when inserting a second power supply, the status light on the new supply will illuminate SOLID GREEN when it's turned on, to indicate normal operation as it starts sharing the load.

If the Xserve is not turned on, the supply status light BLINKS GREEN when the power cord is plugged in to an outlet with power, to indicate that power is available but power to internal components from this supply is on standby.

If the Xserve has two power supplies and no AC power is available to one of the power supplies, or if one of the power supplies has failed, that power supply's status LED will illuminate SOLID

Note: In a redundant power supply configuration, it is strongly recommended that independent AC mains circuits be used to connect to each power supply, if possible. This way, if one AC mains circuit fails, the other AC mains circuit and power supply will continue to supply the entire Xserve system.

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