Server power featuresWhen the server is connected to a power source but is not turned on, the operatingsystem does not run, and all core logic except for the integrated managementmodule (IMM) is shut down; however, the server can respond to requests from theIMM, such as a remote request to turn on the server. The power-on LED flashes toindicate that the server is connected to power but is not turned on.Turning on the serverApproximately 3 minutes after the server is connected to power, the power-controlbutton becomes active, and one or more fans might start running to providecooling while the server is connected to power. You can turn on the server andstart the operating system by pressing the power-control button.The server can also be turned on in any of the following ways:v If a power failure occurs while the server is turned on, the server will restartautomatically when power is restored.v If your operating system supports the Wake on LAN feature, the Wake on LANfeature can turn on the server.For 32-bit operating systems only: Some memory is reserved for various systemresources and is unavailable to the operating system. The amount of memory thatis reserved for system resources depends on the operating system, theconfiguration of the server, and the configured PCI options.Turning off the serverWhen you turn off the server and leave it connected to power, the server canrespond to requests from the IMM, such as a remote request to turn on the server.While the server remains connected to power, one or more fans might continue torun. To remove all power from the server, you must disconnect it from the powersource.Important: To view the error LEDs on the system board, leave the serverconnected to a power source.Some operating systems require an orderly shutdown before you turn off theserver. See your operating-system documentation for information about shuttingdown the operating system.Statement 5CAUTION:The power control button on the device and the power switch on the powersupply do not turn off the electrical current supplied to the device. The devicealso might have more than one power cord. To remove all electrical current fromthe device, ensure that all power cords are disconnected from the power source.Chapter 1. The System x3650 M3 server 23
