Oracle X5-4 Service Manual page 29

Server Subsystems Overview
During an initial Power up sequence, the front fans will briefly run at full speed as part
Note -
of a power-on test.
Standby Power Mode
Standby power is a non-operating mode (OS does not boot), in which low-level power is
supplied only to the components that are required to run the SP. To enter standby power mode,
connect the AC power cables to the back of the server, but do not press the front panel Power
button. You can also enter standby power mode by powering off the server from full power
mode using one of the power-off methods (see below).
In standby power mode, the green SP indicator blinks while the SP is booting. Once the
SP has booted, this SP indicator is steady on, and the green System OK indicator goes to
standby blink (once every 3 seconds). See "Server Boot Process and Normal Operating State
Indicators" on page 41.
Graceful Shutdown
A graceful shutdown (also referred to as an orderly shutdown) is the safest method of shutting
down the server to standby power mode because it warns users, closes files, and prepares the
file system. To perform a graceful shutdown, use the server OS, Oracle ILOM, or the server
front panel Power button.
A Graceful shutdown via the Power button is done with a single (momentary) press. However,
an Immediate (Emergency) shutdown via the power button is done by pressing and holding the
power button for > 5 seconds.
Immediate Shutdown
An immediate shutdown of the server (also referred to as an emergency shutdown) should be
used only in situations when you know that the loss of data is nonexistent or acceptable. An
immediate shutdown does not warn users, does not properly close files, and does not gracefully
shut down the operating system. Full power is immediately removed and the server goes to
standby power mode.
Complete Power Removal
Shutting down the server from full power mode to standby power mode does not completely
remove power from the server. When it is in standby power mode, the server is in a low-power
state. This low-power state is enough to maintain the service processor (SP), which runs Oracle
ILOM. To completely remove power from the server, you need to remove the AC power cords.
Warm Reset or Reboot
A warm reset is a reboot or restart of the server that occurs when you cycle server power from
full power mode to standby power mode and back to full power mode. For example, a warm
Oracle Server X5-4 Overview 29