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(the baseboard management controller (BMC) or optional Remote SupervisorAdapter II SlimLine) is shut down; however, the server can respond to remoterequests from the service processor, such as a remote request to turn on theserver. The power-on LED flashes to indicate that the server is connected to acpower but not turned on.Turning on the serverApproximately 20 seconds after the server is connected to ac power, thepower-control button becomes active, and one or more fans (some models) mightstart running to provide cooling while the server is connected to power. You can turnon the server and 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.v If an optional Remote Supervisor Adapter II SlimLine is installed in the server, theserver can be turned on from the Remote Supervisor Adapter II SlimLine userinterface.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 peripheral component interconnect (PCI, PCI Express, or PCI-X) options.Chapter 1. The System x3400 server 15
