Node canister LEDs

Each node canister has three LEDs that provide status and identification for the node canister.

The three LEDs are located in a horizontal row near the upper right of the canister 1. Figure 1 shows the rear view of the node canister LEDs.
Figure 1. LEDs on the node canisters
This figure shows the LEDs on the node canisters.
Note: The reference to the left and right locations applies to canister 1, which is the upper canister. The port locations are inverted for canister 2, which is the lower canister.
Table 1. Node canister LEDs
Name Description Color Symbol
System status Indicates the status of the node.
  • The on status indicates that the node is active, that is, it is an active member of a clustered system. When the node is active, do not remove it.
  • The off state indicates there is no power to the canister or the canister is in standby mode. These conditions can cause the off state:
    • The main processor is off and only the service processor is active.
    • A power-on self-test (POST) is running on the canister.
    • The operating system is loading.
  • The flashing status indicates that the node is in candidate state or service state. It is not able to perform I/O in a system. When the node is in either of these states, it can be removed. Do not remove the canister unless directed by a service procedure.
 Green
The pulse symbol represents the cluster status LED.
Fault Indicates if a fault is present and identifies which canister.
  • The on status indicates that the node is in service state or an error exists that might be preventing the code from starting. Do not assume that this status indicates a hardware error. Further investigation is required before replacing the node canister.
  • The off status indicates that the node is a candidate or is active. This status does not mean that there is not a hardware error on the node. Any error that was detected is not severe enough to stop the node from participating in a system.
  • The flashing status indicates that the canister is being identified. This status might or might not be a fault.
 Amber
The exclamation mark represents the fault LED.
Power Indicates if power is available and the boot status of the canister.
  • The on status indicates that the canister is powered on and that the main processor or processors are running.
  • The off status indicates that no power is available.
  • The slow flashing (1 Hz) status indicates that power is available and that the canister is in standby mode. The main processor or processors are off and only the service processor is active.
  • The fast flashing (2 Hz) indicates that the canister is running the power-on self-test (POST).
 Green
This figure shows the power LED.
Notes:
  1. If the system status LED is on and the fault LED is off, the node canister is an active member of a system.
  2. If the system status LED is on and the fault LED is on, there is a problem establishing a system.

For a more complete identification of the system LEDs, follow the procedure for understanding the system status using the LEDs.
Parent topic: Node canister ports and indicators