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Chapter 6. Monitoring the device
The power-on self-test (POST) performs diagnostic tests every time the device is powered on, rebooted,
or reset. The LEDs on the device indicate system activity and status.
Interpreting port-side LEDs
System activity and status can be determined through the activity of the LEDs on the switch.
There are 96 bicolor LEDs (green/amber) for the first 96 SFP+ ports and 16 tricolor LEDs (green/amber/
white) for the SFP-DD ports. The last set of LEDs pulse once in white before indicating the FC port status
in green or amber. All functionality pertaining to the green/amber colors for the last 16 LEDs remains the
same as the first 96 LEDs.
The LEDs have three possible states: no light, a steady light, and a flashing light. Flashing lights may be
slow, fast, or flickering. The lights are green or amber.
Sometimes, the LEDs may flash any of the colors during boot, POST, or other diagnostic tests. This
flashing is normal; it indicates a problem only if the LEDs indicate an unhealthy state after all boot
processes and diagnostic tests are complete.
Figure 33. SAN128B-7 port-side LEDs
1. System Power LED
2. System Status LED
3. SFP+ (Upper) Port 1 Status LED
4. SFP+ (Upper) Port 1
5. SFP+ (Lower) Port 7
6. SFP+ (Lower) Port 7 Status LED
7. DD (Upper) Ports 96 and 97 Status LED
8. DD (Upper) Ports 96 and 97
9. DD (Lower) Ports 108 and 109
10. DD (Lower) Ports 108 and 109 Status LED
48 IBM Storage Networking SAN128B-7: SAN128B-7 Installation, Service, and User Guide
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