Servicing Power Supplies; Power Supply Overview - Sun Oracle SPARC T3-2 Service Manual

Servicing Power Supplies

These topics explain how to remove and replace power supply modules.
"Power Supply Overview" on page 101
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"Locate a Faulty Power Supply" on page 102
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"Remove a Power Supply" on page 104
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"Install a Power Supply" on page 106
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Power Supply Overview

These servers are equipped with redundant hot-swappable power supplies. With
redundant power supplies, you can remove and replace a power supply without
shutting the server down, provided that the other power supply is online and
working.
The server offers two redundancy modes for the power supplies. Light load
efficiency mode (LLEM) places PS1 in a warm standby condition while PS0 carries
the entire load more efficiently by itself. If PS0 loses AC power or is extracted for
replacement, PS1 takes over the load automatically. Some rare internal failures of PS0
could cause the server to lose power faster than PS1 can take over.
Disabling the LLEM Policy causes the power supplies to share the load at all times, at
the expense of efficiency during light loads. For information about configuration
policies, refer to the SPARC T3 Series Servers Administration Guide and the Oracle
ILOM documentation.
Caution – If a power supply fails and you do not have a replacement available, to
ensure proper airflow, leave the failed power supply installed in the server until you
replace it with a new power supply.
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