IBM System Storage N3700, Hardware And Service Manual

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Table 13. Fibre Channel LED interpretation (continued)
Fault LED
(amber)
Fibre Channel
B LED (green)
Fibre Channel
C LED (green) State Action
On Off On Loop B fault and
module fault
See Note below.
On On Off Loop C fault and
module fault
See Note below.
Note: Perform the following steps until the problem is resolved:
1. Check the cables at the rear of the system.
2. Make sure that the 1 Gb/2 Gb switches are set to 1 Gb.
3. Check all terminate switches. Last shelf in the loop must be set to On. All
other shelves must be set to Off.
4. If Fibre Channel C port is unused, install the Fibre Channel terminator or
ignore the Fibre Channel C LED. It is alright for the LED to be off if the
port is not used.
5. Run diagnostics to isolate the failure and decide whether CPU module
replacement is necessary. See the IBM System Storage N series
Diagnostics Guide for more information.
6. Call IBM technical support to replace the CPU module.
Chapter 4. Monitoring your system
25