Troubleshooting QoS

Quality of service (QoS) provides several methods to troubleshoot QoS problems.

Communications trace

Your system provides a communication trace to collect data on a communication line, such as a local area network (LAN) or wide area network (WAN) interface. The average user might not understand the entire contents of the trace data. However, you can use the trace entries to determine whether a data exchange between two points actually took place.

Enabling QoS on the system

If the QoS server does not start, first check whether QoS is enabled on the system. When you configure your policies for the first time, the Initial Configuration wizard automatically enables QoS on the system. However, if this value has been changed for any reason, the server will not start.

To verify that QoS is enabled on the system, follow these steps:

1. In iSeries™ Navigator, expand your system > Network > IP Policies.

2. Right-click Quality of service and select Configuration.

3. When the QoS interface is displayed, right-click QoS and select Properties.

4. On the QoS properties page, verify that Enable QoS is selected.

• Journaling QoS policies
  Quality of service (QoS) includes a journaling function. Journaling allows you to track QoS policy actions when a policy is added, removed, or changed.

• Logging QoS server jobs
  When you encounter problems with your quality of service (QoS) policies, analyze the job logs. The job log contains error messages and other information related to QoS.

• Monitoring system transactions
  With the quality of service (QoS) monitor, you can verify that the QoS policies are working as you intend them to work. The QoS monitor can help you in the planning phase and the troubleshooting phase of QoS.

• Trace TCP applications
  You can use the quality of service (QoS) trace to work with trace functions and to see the current trace buffer.

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Related concepts
Communications trace