IBM Flex System p270 Compute Node Installation And Service Manual page 461

v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v See Chapter 7, "Parts listing for IBM Flex System p270 Compute Node," on page 95 to determine which
components are CRUs and which components are FRUs.
v If an action step is preceded by "Trained service technician only," that step must be performed only by a
trained service technician.
Symptom
Intermittent connectivity
problems (two or more
compute nodes)
Intermittent external device
problems
Intermittent Kernel-based
Virtual Machine (KVM)
problems
Intermittent unexpected reboot
problems
Action
1. Using the diagnostic tools that are provided by the device manufacturer, test
the I/O module that the devices are connected to.
2. Attempt to connect one compute node to the network first, and connect other
compute nodes, one by one, to try to isolate the problem.
3. Update the I/O module firmware, if necessary.
Note: Restarting the compute node and running POST diagnostics on the I/O
module might also help isolate the problem; however, this might have other
ramifications to the network.
1. Make sure that the correct device drivers are installed. See the manufacturer's
website for documentation.
2. For a USB device:
a. Make sure that the device is configured correctly (see "Using the SMS
utility" on page 18).
b. 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 (see "Using the SMS utility" on
page 18).
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.
Check for an event code that indicates a compute node restarting. Some
correctable errors require that the compute node reboot so that it can disable a
device, such as a memory DIMM or a microprocessor to allow the machine to
boot properly. See the action plan for the error to resolve the problem.
Chapter 8. Troubleshooting
449