IBM 419452u - Servers System X3250 M2 Xeon 3.0ghz Installation Manual page 44

v You can press the power-control button to start an orderly shutdown of the
v If the operating system stops functioning, you can press and hold the
v If an optional Remote Supervisor Adapter II SlimLine is installed in the server, the
v The integrated systems-management processor (mini-BMC) can turn off the
v You can turn off the server through a request from the service processor.
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IBM System x3250 M2 Types 4190 and 4194: Installation Guide
operating system and turn off the server, if your operating system supports this
feature.
power-control button for more than 4 seconds to turn off the server.
server can be turned off from the Remote Supervisor Adapter II SlimLine user
interface.
server as an automatic response to a critical system failure.