Servicing Power Supplies (Cru) - Sun Oracle Sun Server X4-2 Service Manual

Otherwise, return the server to operation.
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See "Returning the Server to Operation" on page
Related Information
"Remove a Fan Module" on page 51
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Servicing Power Supplies (CRU)

The redundant power supplies on the server 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 model A256 (600 watt) power supplies. The A256 power supply
unit (PSU) provides conversion from the AC lines to the system, accepting ranges
from 100-240 volts AC (VAC). These PSUs are designed to be hot-swappable, and in
most cases will provide fully redundant "1+1" power, 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 PSU. The PSUs
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
PSU. This over-subscription support is accomplished using hardware signaling
between the PSU and motherboard circuitry, which can force the system to throttle
maximally CPU and memory power in the event that a PSU 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 indicators are lit when a power supply fault is detected:
Front and rear Service Required LEDs
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Amber Service Required LED on the faulty power supply
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Rear Power Supply Fault LED located on the server front panel (see
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Controls and Indicators on a System With Eight 2.5-inch Drives" on page
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.
In addition to the service procedures included here, you can see animations that
show how to remove and install the power supplies.
Servicing CRUs That Do Not Require Server Power-Off
143.
"Front Panel
3)
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