Oracle EXADATA X6-2, Service Manual, Page: 80 / 284

Servicing Power Supplies (CRU)
80 Oracle Server X6-2 Service Manual • June 2016
7.
Consider your next step:
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If you installed the fan module as part of another procedure, return to that procedure.
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Otherwise, return the server to operation. See “Returning the Server to
Operation” on page 187 .
Related Information
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“Remove a Fan Module” on page 76
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 (LEDs) are lit when a power supply fault is detected:
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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 “Front Panel Controls
and Indicators” on page 14 )
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.
For more information, refer to the following topic and procedures:
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“Power Supply Status Indicators” on page 81
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“Remove a Power Supply” on page 81
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“Install a Power Supply” on page 83