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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.
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.
i
!
Light Path
CPU
Diagnostics™
MEMORY
DASD
PCI-X BUS
NMI
BOARD
FAN
TEMP
EVENT LOG
1
VRM
POWER
SUPPLY
2
NON REDUND
OVER SPEC
REMIND
Chapter 1. Technical description
25
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