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2-4 SPARC Enterprise M4000/M5000 Servers Installation Guide • December 2010
2.2.1.1 Facility Power Requirements and Characteristics
For proper redundancy your facility should have two independent power sources:
Either circuit breakers connected to separate power company utility feeds or UPS
(uninterruptible power system). For power redundancy the power cords should not
be connected to the same facility power source.
If the computer equipment is subjected to repeated power interruptions and
fluctuations, it is susceptible to a higher component failure rate than it would be with
a stable power source. There are two basic configurations:
■ Power Cords With Redundant PSU Connection (FIGURE 2-1 and FIGURE 2-2)
■ Power Cords With Dual-power Feed Connection (FIGURE 2-3 and FIGURE 2-4)
Note – If more than one power cord of this server is connected directly to the same
facility power source distribution panel, connect the power cords to outlets
independently using one cable per power feed.
FIGURE 2-1 M4000 Server With Redundant PSU Connection
PSU#0
PSU#1
#0
#1
Circuit
breaker