Intermittent problems

Use this information to solve intermittent problems.

Intermittent external device problems

Complete the following steps until the problem is solved.
  1. Make sure that the correct device drivers are installed. See the manufacturer's website for documentation.

  2. For a USB device:

    1. Make sure that the device is configured correctly.

      Restart the server and press F1 to display the Lenovo XClarity Provisioning Manager system setup interface. Then, click System Settings > Devices and I/O Ports > USB Configuration.

    2. Connect the device to another port. If using a USB hub, remove the hub and connect the device directly to the compute node. Make sure that the device is configured correctly for the port.

Intermittent KVM problems

Complete the following steps until the problem is solved.

Video problems:

  1. Make sure that all cables and the console breakout cable are properly connected and secure.
  2. Make sure that the monitor is working properly by testing it on another compute node.
  3. Test the console breakout cable on a working compute node to ensure that it is operating properly. Replace the console breakout cable if it is defective.

Keyboard problems:

Make sure that all cables and the console breakout cable are properly connected and secure.

Mouse problems:

Make sure that all cables and the console breakout cable are properly connected and secure.

Intermittent unexpected reboots

Note: Some correctable errors require that the server reboot so that it can disable a device, such as a memory DIMM or a processor to allow the machine to boot up properly.
  1. If the reset occurs during POST and the POST watchdog timer is enabled, make sure that sufficient time is allowed in the watchdog timeout value (POST Watchdog Timer).

    To check the POST watchdog time, restart the server and press F1 to display the Lenovo XClarity Provisioning Manager system setup interface. Then, click BMC Settings > POST Watchdog Timer.

  2. If the reset occurs after the operating system starts, disable any automatic server restart (ASR) utilities, such as the Automatic Server Restart IPMI Application for Windows, or any ASR devices that are installed.

  3. See the management controller event log to check for an event code that indicates a reboot. See Event logs for information about viewing the event log.