IBM 86884RX Installation Guide - Page 39

1.10 Light path diagnostics To limit the need to slide the server out of the rack to diagnose problems, a light path diagnostics panel has been incorporated in the front of the x450, as shown in Figure 1-14. This panel can be ejected from the server to view all light path diagnostics-monitored server subsystems. In the event that maintenance is then required, the customer can slide the server out from the rack and, using the LEDs, find the failed or failing component. As illustrated in Figure 1-14, light path diagnostics is able to monitor and report on the health of CPUs, main memory, hard disk drives, PCI-X and PCI slots, fans, power supplies, VRMs, and the internal system temperature. FAN 1 2 SUPPOPWLYER PCDI ABMSUDESCMPOURY TEMP REMINODVNEROVNSRPRMEECDEVEBNOTNAMRLODI G i ! CPU MEMORY Light Path Diagnostics™ DASD PCI-X BUS NMI BOARD FAN TEMP EVENT LOG 1 POWER 2 SUPPLY VRM NON REDUND OVER SPEC REMIND Figure 1-14 Light path diagnostics panel on the x450 Important: If a light path diagnostics LED has been illuminated and system power is removed, there is no way to redisplay the LEDs on the system tray without re-applying AC power. If the fault has not been rectified when power is restored, the LED will re-light. The light path diagnostics on the x450 has four levels: 1. The first level is the front panel fault LED. 2. Level 2 is the pop-out panel as shown in Figure 1-14. 3. For further investigation, there are light path diagnostics LEDs visible through the top of the server. This requires the server to be slid out of the rack. Chapter 1. Technical description 25