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System LED panel
The following illustration shows the status LEDs on the system LED panels on the
front and rear of the BladeCenter unit.
Power-on
Location
Over-temperature
Information
System error
Attention: If the power-on LED is off, it does not mean there is no electrical
current present in the BladeCenter unit. The LED might be burned out. To remove
all electrical current from the BladeCenter unit, you must unplug all power cords
from all power modules.
Note: You can turn off the location LED and the information LED through the Web
interface or the IBM Director console.
Power-on: When this green LED is lit, power is present in the BladeCenter unit.
When this LED is off, the power subsystem, the ac power, or the LED has
failed, or the management module is not present or not functioning.
Location: When this blue LED is lit or flashing, it has been turned on by the
system administrator to aid in visually locating the BladeCenter unit. If a blade
server requires attention, the location LED on the blade server usually will also
be lit. After the BladeCenter unit has been located, you can have the system
administrator turn off the location LED.
Over-temperature: When this amber LED is lit, the temperature in the
BladeCenter unit exceeds the temperature limits, or a blade server has reported
an over-temperature condition. The BladeCenter unit might have already taken
corrective action, such as increasing the blower speed. This LED turns off
automatically when there is no longer an over-temperature condition.
Information: When this amber LED is lit, a noncritical event has occurred that
requires attention, such as the wrong I/O module inserted in a bay or power
demands that exceed the capacity of power modules currently installed. The
event is recorded in the event log. Check the LEDs on the BladeCenter unit and
the blade servers to isolate the component. After the situation is handled, have
the system administrator turn off the information LED.
Note: The information LED will also light if the system error log is 75% full.
System-error: When this amber LED is lit, it indicates that a system error has
occurred, such as a failed module or a system error in a blade server. An LED
on one of the components or on a blade server is also lit to further isolate the
error. (For more information, see “Identifying problems using the Light Path
Diagnostics feature” on page 29.)
Setting up the BladeCenter unit
This section briefly discusses considerations for the setup of your BladeCenter unit.
v Blade bays must be occupied at all times.
To help ensure proper cooling, performance, and system reliability, make sure
that each of the blade bays on the front of the BladeCenter unit has a blade
server, expansion unit, or filler blade installed.
Important: When replacing a blade server or installing an expansion option, do
not operate the BladeCenter unit for more than one minute without either a blade
server, an expansion option, or a filler blade installed in each blade bay.
Chapter 1. General information 17