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• The cables for all external SCSI devices are connected correctly.
• The last device in each SCSI chain, or the end of the SCSI cable, is terminated correctly.
• Any external SCSI device is turned on. You must turn on an external SCSI device before you turn on
the compute node.
4. Reseat the failing device.
5. Replace the failing device.
Performance problems
Use this information to solve performance problems.
• "Network performance" on page 113
• "Operating system performance" on page 113
Network performance
Complete the following steps until the problem is solved:
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 compute node.
• "Single compute node does not power on" on page 113
• "Multiple compute nodes do not power on" on page 114
• "Compute node does not power off" on page 114
Single compute node does not power on
Complete the following steps until the problem is resolved:
1. If you recently installed, moved, or serviced the compute node, reseat the compute node in the bay. If
the compute node was not recently installed, moved, or serviced, perform a virtual reseat through the
CMM service command. For more information about the CMM service command, see the "Flex System
.
Chapter 4
Problem determination
113
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