IBM RS/6000 7024 E Series, Service Manual

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Power Switch and Indicator LEDs
The power switch and light-emitting diodes (LEDs) on the front of your server allow
you control power to the server, observe system power status, and observe disk
activity.
These features also have other built-in capabilities to assist you in diagnosing system
problems and observing system status:
Ÿ
As soon as the system unit is connected to a power source, the power LED will
begin blinking slowly (about 2 flashes per second) to indicate that Standby Power
is on, even though the system unit is not powered on or running.
Ÿ
When the system unit is turned on by pressing the power switch, the power LED
lights steadily.
If the operating system is loaded and running, a memory dump of system information
can be requested.
Ÿ
To enable this function, the sysdumpdev -K command must be executed before
an error condition exists.
Ÿ
To request a memory dump, press and hold the power switch for longer than two
seconds. Requesting a memory dump directs the operating system to save
system information to a predefined file before turning off the system. This feature
can be used to assist in recovery from system problems.
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Service Guide