Oracle X7-8, Service Manual

Page: 139 / 308

Servicing Power Supplies (CRU)
The power supplies are located at the front of the server. See the following procedures:
■
“Power Supply Overview” on page 139
■
“Remove a Power Supply” on page 141
■
“Install a Power Supply” on page 144
For component serviceability, locations, and designations, see “Identifying
Components” on page 24 .
Power Supply Overview
The server's redundant power supplies support concurrent maintenance, which enables you to
remove and replace a power supply without shutting down the server, provided that the other
power supply is online and working.
The server supports four 3060 watt power supplies. The power supply units (PS0 - PS3) provide
conversion from the AC lines to the system, accepting ranges from 100-240 volts AC (VAC).
These front panel accessible PSs are designed to be hot-pluggable, and in most cases will
provide fully redundant “1+1” power to two SMODs (1+1 for each side), allowing the system
to suffer the loss of a PSU or an AC feed with no loss to system availability.
In maximally configured systems, it is possible that the worst-case power consumption of
the system could exceed the capacity of a single PS. The PSs provide an over-subscription
mode, which allows the system to operate with fault-tolerance even with modest excursions
beyond the rated capacity of a single PS. This over-subscription support is accomplished using
hardware signaling between the PS and motherboard circuitry, which can force the system to
throttle processor (CPU) and memory power in the event that a PS is lost. The resulting power
savings will be enough to allow the system to continue to run (in a lower-performance state)
until the power problem is resolved.
The following status indicators (LEDs) are lit when a power supply fault is detected:
■
Front and back Fault-Service Required LEDs
■
Amber Fault-Service Required LED on the faulty power supply
■
Back Power Supply Fault-Service Required LED located on the server front panel FIM
If a power supply fails and you do not have a replacement available, leave the failed power
supply installed to ensure proper airflow in the server.
Servicing Components 139