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Troubleshooting Node down and unresponsive via console or Service Processor

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Applies to

Issue

  • Node fails, which may or may not be taken over by partner.
  • Node fails to boot and serial console connection may yield no output.
  • Connection via SP/BMC may also fail.
    • Terminal screen is blank 
  • Physical inspection may show the controller has no lit LEDs and appears powered off despite connections to known good power.
  • Powercycle of SP/BMC or node does not fix the issue. - How to use the SP or BMC to non-disruptively powercycle a node
  • Attempt to connect to SP or BMC (which may or may not be accessible) and gather logs:
  • If SP/BMC is unresponsive over SSH, connect to console port with serial cable and hit Enter to determine if console is responsive/at LOADER.
  • If there is no output, attempt to toggle to SP/BMC with CTRL+G from a serial console connection and collect the same log output as above.

Note: To exit back to the console from the SP/BMC, use CTRL+D. For A700s systems, use Esc+T to return to the console instead.

  • Once logs have been collected or deemed impossible to collect, Reseat the controller (unseat from midplane, leave out for 1-2 minutes, seat back in place)

 

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