You can use the Server Locator LEDs to identify one particular server from many other servers.
-> set /System/locator_indicator=on
The white Server Locator LEDs (one on the front panel and one on the rear panel) blink for about 30 minutes before turning off.
Alternatively, you can type an Oracle ILOM command to turn off the Locator LED.
-> set /System/locator_indicator=off