Chapter 13. RAS, monitoring, and troubleshooting 677
13.1.2  Expansion canisters
As Figure 13-2 shows, two 12 Gbps SAS ports are side by side on the canister of every 
enclosure. They are numbered 1 on the left and 2 on the right. Similar to the controller 
canisters, expansion canisters are also installed in the enclosure side by side in a vertical 
position.
Figure 13-2   Expansion canister status LEDs
The interpretation of the SAS status LED indicators has the same meaning as the LED 
indicators of SAS ports in the control enclosure (Table 13-3 on page 676). 
Table 13-5 lists the LED status values of the expansion canister.
Table 13-5   Expansion canister LEDs statuses
Right Amber Fault On The canister is in a se rvice state, or in error, preventing 
the software from starting.
Flashing 
(2 Hz)
Canister is being identified.
Off Node is either in candidate or active state.
Position Color Nam e State Meaning
Position Color Nam e State Meaning
Left Green Power On The canister is powered on.
Off No power available to the canister.
Middle Green Status On The canister is operating normally.
Flashing There is an error with the vital product date 
(VPD).
Right Amber Fault On There is an error logged against the canister 
or the system is not running.
Flashing Canister is being identified.
Off No fault, canister is operating normally.
SAS Indicators
- green: link
- amber: fault
Canister LEDs
- green left: power
- green horse-shoe: status
- amber: fault