IBM System x3250 Installation Manual

Also see for System x3250: Installation and user guide User guide Specifications Problem determination and service guide

Contents

Server power featuresWhen the server is connected to an ac power source but is not turned on, theoperating system does not run, and all core logic except for the service processor isshut down; however, the server can respond to requests from the service processor(the baseboard management controller), such as a remote request to turn on theserver.Turning on the serverApproximately 20 seconds after the server is connected to ac power, thepower-control button becomes active, and one or more fans might start running toprovide cooling while the server is connected to power. You can turn on the serverand start 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 systems-management software for anoptional Remote Supervisor Adapter II SlimLine, the systems-managementsoftware can turn on the server.v If your operating system supports the Wake on LAN feature, the Wake on LANfeature can turn on the server.Note: When 4 GB or more of memory (physical or logical) is installed, somememory is reserved for various system resources and is unavailable to theoperating system. The amount of memory that is reserved for system resourcesdepends on the operating system, the configuration of the server, and theconfigured PCI optional devices.Turning off the serverWhen you turn off the server and leave it connected to ac power, the server canrespond to requests from the service processor, such as a remote request to turnon the server. While the server remains connected to ac power, one or more fansmight continue to run. To remove all power from the server, you must disconnect itfrom the 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 theoperating system.Chapter 3. Server controls, LEDs, and power 23