1. Isolate which network is operating slowly (such as storage, data, and management). You might find it
helpful to use ping tools or operating-system tools such as task manager or resource manager.
2. Check for traffic congestion on the network.
3. Update the NIC device driver, or the storage device controller device driver.
4. Use the traffic-diagnostic tools that are provided by the IO-module manufacturer.
Operating system performance
Complete the following steps until the problem is solved:
1. If you have recently made changes to the compute node (for example updated device drivers or installed
software applications) remove the changes.
2. Check for any networking issues.
3. Check the operating system logs for performance related errors.
4. Check for events related to high temperatures and power issues as the compute node might be throttled
to help with cooling. If it is throttled, reduce the workload on the compute node to help improve
performance.
5. Check for events related to disabled DIMMs. If you do not have enough memory for the application
workload, your operating system will have poor performance.
6. Ensure that the workload is not too high for the configuration.
Power on and power off problems
Use this information to resolve issues when powering on or powering off the server.
•
“The power button does not work (server does not start)” on page 479
• “Server does not power on” on page 480
• “Server does not power off” on page 480
The power button does not work (server does not start)
Note: After the server is connected to AC power, it will take one to three minutes for XCC to initialize. The
power button does not work during the initialization.
Complete the following steps until the problem is resolved:
1. Make sure that the power button on the server is working correctly:
a. Disconnect the server power cords.
b. Reconnect the server power cords.
c. Reconnect the front operator panel cable, and then repeat steps 1a and 1b.
• If the server starts, reseat the front operator panel.
• If the problem remains, replace the front operator panel.
2. Make sure that:
• The power cords are correctly connected to the server and to a working electrical outlet.
• The LEDs on the power supply units work normally.
• The power button LED is lit on and flash slowly.
• The button-push force is sufficient and the button shows release response after pushed.
3. If the power button LED does not light on or flash correctly, reseat all the power supply units and make
sure that the power input status LED is lit on.
4. If you have just installed an optional device, remove it, and restart the server.
Chapter 8. Problem determination 479
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