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Note: Some memory is reserved for various system resources and is unavailable
to the operating system. The amount of memory that is reserved for system
resources depends on the operating system, the configuration of the server, and the
configured PCI options.
Turning off the server
When you turn off the server and leave it connected to ac power, the server can
respond to requests from the IMM, such as a remote request to turn on the server.
While the server remains connected to ac power, one or more fans might continue
to run. To remove all power from the server, you must disconnect it from the
power source.
Important: To view the error LEDs on the system board, leave the server
connected to a power source.
Some operating systems require an orderly shutdown before you turn off the
server. See your operating-system documentation for information about shutting
down the operating system.
Statement 5
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current from
the device, ensure that all power cords are disconnected from the power source.
The server can be turned off in any of the following ways:
v You can turn off the server from the operating system, if your operating system
supports this feature. After an orderly shutdown of the operating system, the
server will be turned off automatically.
v You can press the power-control button to start an orderly shutdown of the
operating system and turn off the server, if your operating system supports this
feature.
v If the operating system stops functioning, you can press and hold the
power-control button for more than 4 seconds to turn off the server.
v The IMM can turn off the server as an automatic response to a critical system
failure.
v You can turn off the server through a request from the IMM.
20 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide