Compute node controls, connectors, and LEDs

Use this information for details about the controls, connectors, and LEDs.

The following illustration identifies the buttons, connectors, and LEDs on the control panel.

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Hard disk drive activity LED (green)
When this green LED is lit, it indicates that the hard disk drive is powered on. When flashing, this LED indicates that the drive is in use.
Hard disk drive status LED (yellow)
When this yellow LED is lit, it indicates that an error has occurred with the hard disk drive. The LED turns off only after the error is corrected. You can check the CMM event log to determine the source of the condition. For more information, see Viewing event logs without restarting the compute node.
SMP expansion connectors
Use these connectors to connect the compute node to other compute nodes to form multi-node complexes. The SMP expansion connectors come protected by a filler that you can remove. For more information, see Installing an SMP expansion connector.
Link error LED
When this yellow LED is lit, it indicates that a scalable link error occurred.
Link up LED
When this green LED is lit, it indicates that the compute node is connected to other compute nodes through a quick path interconnect (QPI) link.
Note: When the Link error LED is lit, indicating that a scalable partitioning error occurred, this LED is turned off.
Scaling LED
When this white LED is lit, it indicates that the compute node is part of a scalable partition. When turned off, this LED indicates that the compute node is operating independently.
Note: This LED is operational and can be lit when the compute node is installed in the chassis and is connected to power, even if the compute node is not turned on.
Fault LED
When this yellow LED is lit, it indicates that a system error has occurred in the compute node. In addition, the fault LED on the chassis system LED panel is lit. You can check the CMM event log to determine the source of the condition. For more information, see Viewing event logs without restarting the compute node. See also Light path diagnostics LEDs for more information about the LEDs on the compute node.
The fault LED turns off only after the error is corrected.
Note: When the fault LED turns off, you should also clear the IMM event log. Use the Setup utility to clear the IMM event log.
Check log LED

When this yellow LED is lit, it indicates that a condition that causes an event to be logged in the event log has occurred. To view the IMM2 event log see IMM event log

The check log LED can be turned off through the CMM led command, the CMM web interface, or Flex System Manager management software (if installed).

Notes:
  1. Alternatively, you can use the CMM_INDICATES_ITE_ERROR_N command to light the check log LED. See the Flex System Chassis Management Module: Command-Line Interface Reference Guide for more information.
  2. You can check the CMM event log to determine the source of the condition. For more information, see Viewing event logs without restarting the compute node.
Identify LED
The system administrator can remotely light this blue LED to aid in visually locating the compute node. When this LED is lit, the identify LED on the Flex System chassis is also lit. The identify LED can be lit and turned off through the CMM led command, the CMM web interface, or Flex System Manager management software (if installed).

When this LED is lit in a scalable partition, the identify LED on all nodes in the scalable partition are also lit.

Power button/LED
When the compute node is connected to power through the Flex System chassis, press this button to turn on or turn off the compute node.

When you press the power-control button on any compute node in a single partition (controlled by one operating system), all compute nodes in the single partition will be turned on or turned off.

Note: The power button works only if local power control is enabled for the compute node. Local power control is enabled and disabled through the CMM power command and the CMM web interface.

After the compute node is removed from the chassis, press and hold this button to activate the system-board LEDs (light path diagnostics). See Compute node controls, connectors, and LEDs for more information.

This button is also the power LED. This green LED indicates the power status of the compute node:
  • Flashing rapidly: The LED flashes rapidly for one of the following reasons:
    • The compute node has been installed in a chassis. When you install the compute node, the LED flashes rapidly for up to 90 seconds while the integrated management module II (IMM2) in the compute node is initializing and synchronizing with the chassis management module.
    • Power permissions have not been assigned to the compute node through the Chassis Management Module.
    • The Flex System chassis does not have enough power to turn on the compute node.
    • The IMM2 in the compute node is not communicating with the Chassis Management Module.
  • Flashing slowly: The compute node is connected to power through the Flex System chassis and is ready to be turned on.
  • Lit continuously: The compute node is connected to power through the Flex System chassis and is turned on.

When the compute node is on, pressing this button causes an orderly shutdown of the compute node so that it can be removed safely from the chassis. This includes shutting down the operating system (if possible) and removing power from the compute node.

If an operating system is running, you might have to press the button for approximately 4 seconds to initiate the shutdown.

Attention: Pressing the button for 4 seconds forces the operating system to shut down immediately. Data loss is possible.
KVM connector
Connect the console breakout cable to this connector (see Console breakout cable for more information).
Note: It is best practice to connect the console breakout cable to only one compute node at a time in each Flex System chassis.
USB connector
Connect a USB device to this connector.
Note: It is best practice to connect a USB device to the front of only one compute node at a time in each Flex System chassis.
Parent topic: Power, controls, and indicators