About Power Supplies - Sun Microsystems Enterprise 250 Owner's Manual

About Power Supplies

A central power distribution board delivers DC power for all internal system
components. The system's power supplies plug in to connectors on this board, and
when both supplies are installed, they share equally in satisfying the power
demands of the system.
Power supplies are modular units, designed for fast, easy installation or removal,
even while the system is fully operational. Supplies are installed in bays at the rear
of the system, as shown in the following figure.
Power supply 1
Power supply 0
The system can accommodate one or two power supplies. Each supply provides up
to 360 watts of DC power. All system configurations can operate with only one
power supply installed. A second supply can be used to provide N+1 redundancy,
allowing the system to continue operating should one of the power supplies fail.
Power supplies in a redundant configuration feature a "hot swap" capability. You
can remove and replace a faulty power supply without turning off the system power
or even shutting down the operating system.
Chapter 4 Hardware Configuration 57