User`s guide

• Turns on the fault (amber) LED on the front upper right corner of the SW300
cabinet
• Activates an audible alarm
• Increases the speed of the blowers
Figure 5–5 shows the EMU front panel LEDS which display information when
the subsystem is turned on or encounters a problem.
Figure 5–5 EMU Front Panel LEDs and Switches
5
6
7
8
BLOWERS
BLOWERS
1
2
3
4
AUDIBLE
ALARM SWITCH
SYSTEM OK
TEMPERATURE
SHELF FAULT
CXO-4310A-MC
5.8.2 Controller Fault Detection
If the controller detects a storage device failure/fault, or a fault in the other
controller in a dual-redundant configuration, it illuminates the fault (amber)
LED on the EMU. When a special ‘‘controller alive’’ signal from either controller
indicates to the EMU that a controller is not functioning, the EMU does the
following:
• Turns on its fault (amber) LED
• Turns off its System OK (green) LED
• Activates an audible alarm
The HSZ40–Bx controller generates an error message on the maintenance
terminal when it detects one of the following fault conditions:
• A power supply SBB has failed
• A blower has failed or is either not installed or not connected
• The operating temperature is too high
Controller Operations 5–25