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.


compute node control panel buttons, connectors, and LEDs
Power button/LED (green)
When the compute node is connected to power through the Lenovo Flex System chassis, press this button to turn on or turn off the compute node.
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 powered chassis. When you install the compute node, the LED flashes rapidly while the integrated management module II (IMM2) in the compute node is initializing and synchronizing with the Chassis Management Module. The time required for a compute node to initialize varies by system configuration.
    • Power permissions have not been assigned to the compute node through the Chassis Management Module.
    • The Lenovo 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.

    The power LED blink rate slows when the compute node is ready to be turned on.

  • Flashing slowly: The compute node is connected to power through the Lenovo Flex System chassis and is ready to be turned on.
  • Lit continuously: The compute node is connected to power through the Lenovo 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.
Identify LED (blue)
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 Lenovo Flex System chassis is also lit. The identify LED can be lit and turned off through the CMM led command, the CMM web interface and the Lenovo XClarity Administrator application (if installed) or Flex System Manager management software (if installed).
Check log LED (yellow)
When this yellow LED is lit, it indicates that a condition that causes an event to be logged in the IMM event log has occurred.

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

Note:
  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.
Fault LED (yellow)
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 and the light path diagnostics LEDs to determine the source of the condition. For more information, see Viewing event logs without restarting the compute node. See 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.
I/O expansion unit fault LED (yellow)
When this yellow LED is lit, it indicates that an error has occurred in an I/O expansion unit that is installed in the compute node. In addition, the compute node fault LED and the fault LED on the chassis system LED panel are lit. You can check the CMM event log and the light path diagnostics LEDs to determine the source of the condition. For more information, see Viewing event logs without restarting the compute node. See 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.
Hard disk drive activity LED (green)
Green LEDs are on all hot swap drives. When this green LED is lit, it indicates that there is activity on the associated hard disk or solid state drive.

  • When this LED is flashing, it indicates that the drive is actively reading or writing data.

  • For SAS and SATA drives, this LED is off when the drive is powered but not active.

  • For NVMe (PCIe SSD) solid state drives, this LED is on solid when the drive is powered but not active.

Note: The hard disk drive activity LED might be in a different location on the front of the hard disk drive, depending on the drive type that is installed.
Hard disk drive status LED (yellow)
The state of this yellow LED indicates an error condition or the RAID status of the associated hard disk or solid state drive:
  • When the yellow LED is lit continuously, it indicates that an error has occurred with the associated 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.
  • When the yellow LED flashes slowly, it indicates that the associated drive is being rebuilt.
  • When the yellow LED flashes rapidly, it indicates that the associated drive is being located.
Note: The hard disk drive status LED might be in a different location on the front of the hard disk drive, depending on the drive type that is installed.
KVM connector
Connect the console breakout cable to this connector (see Console breakout cable for more information).
Attention: Use only the console breakout cable that comes with the compute node. Attempting to connect other console breakout cable types might damage the console breakout cable and the compute node.
Note: It is best practice to connect the console breakout cable to only one compute node at a time in each Lenovo Flex System chassis.
USB connector
Connect a USB device to this USB 3.0 connector.
Note: It is best practice to connect a USB device to the front of only one compute node at a time in each Lenovo Flex System chassis.
Parent topic: Power, controls, and indicators