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Chapter 2 NAS Head 2-23
2.5.6 System ID LEDs
A pair of blue LEDs, one at the rear of the server, and one on the front panel, can be
used to easily identify the server when it is part of a large stack of servers. A single
blue LED located at the back edge of the server board next to the backup battery is
visible through the rear panel. The two LEDs mirror each other and can be
illuminated by the Baseboard Management Controller (BMC) either by pressing a
button on the chassis front panel or through server-management software. When the
button is pressed on the front panel, both LEDs illuminate and stay illuminated until
the button is pressed again. If the LED is illuminated through a remote System
Identify command, the LED turns off after a timeout period. See Figure 2-5 on
page 2-21 for the location of the rear Main Board LED. The front panel ID LED and
the ID activation button are shown in Figure 2-6.
FIGURE 2-6 Location of Front-Panel ID Pushbutton and LED
ID LED
ID Pushbutton