Power Control, Shutdown, and Reset States
This section contains information about power modes, server shutdowns, and server
resets.
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Main Power Mode
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When the server enters Main power mode, power is supplied to
all the server components, the server boots, and the operating
system (OS) functions. This is the normal operating condition
for the server. The System OK and SP OK indicators are steady
on.
To enter Main power mode, press the On/Standby button on the
server front panel when the server is in Standby power mode. You
can also enter Main power mode by powering on the server from
Oracle ILOM.
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Standby Power Mode
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In Standby power mode, low-level power is supplied only to the
components required to run the SP. The OS does not boot.
To enter Standby power mode, either:
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Connect the AC power cables to the back of the server
but do not press the Power button.
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From Main power mode, either press the front panel
On/Standby button, or use Oracle ILOM.
When you connect power to the server, the SP boots. The SP OK
indicator blinks while the SP is booting, then remains steady on
once it has booted. The System OK indicator flashes briefly
every 3 seconds.
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Graceful Shutdown
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A graceful shutdown (also referred to as an orderly shutdown)
closes files and prepares the file system before it shuts down
the server to Standby power mode. Graceful Shutdown is
the safest method of shutting down the
server.
Power off the server gracefully to prevent data from being
corrupted. Performing a graceful shutdown ensures that the
system is ready for restart.
To perform a graceful shutdown use the server OS, Oracle ILOM,
or the server front panel Power button.
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Immediate Shutdown
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An immediate shutdown (also referred to as an emergency
shutdown) shuts down the host immediately without closing files
or preparing the file system. Immediate Shutdown
should be used only in situations when you know that the
chance of losing data is nonexistent or acceptable.
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Complete Power Removal
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To completely remove power from the server, remove the power
cords.
Shutting down the server from Main power mode to Standby power
mode does not completely remove power from
the server. When the server is in Standby power mode, it is in a
low-power state. The low-power state maintains the service
processor (SP), which runs Oracle ILOM.
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Warm Reset or Reboot
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A warm reset is a reboot or restart of the server. It requires
cycling the server power from Main power mode to Standby power
mode and back to Main power mode. For example, a warm reset
might be required after a software or firmware update or to
access the BIOS Setup Utility.
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Cold Reset
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A cold reset of the server is a restart of the server from a
completely powered-off state. A cold reset might be required to
resolve a system issue. To perform a cold reset, place the
server in Standby power mode, disconnect the server from its
power source by performing a complete power removal (see above),
wait 30-60 seconds, and then connect the server to its power
source.
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