Expert Advice

N3T_TN3270_Avg_SNA_Resp_Time  
Situation Description
Suggested Actions
Situation Description

The average SNA response time measured over the last response time collection interval

 

Suggested Actions

Average SNA response time measured over the last response time collection interval. Response time collection interval is specified on the AvgSampPeriod parameter of MONITORGROUP statement in the TCP/IP profile dataset. The SNA response time is calculated by subtracting the Average IP Response Time from the Average Total Response time.

The most likely causes of a high average SNA response time are an application workload spike or z/OS system resource constraints.

  • If the cause is a spike in application workload (for example, the number of currently active connections is a high percentage of the high water mark for the number of currently active connections), consider creating an additional instance of the application.
  • If the cause is not a spike in the application workload (for example, the number of currently active connections is not a high percentage of the high water mark for the number of currently active connections), then determine whether system resource constraints exist.

To further investigate system resource constraints, use the z/OS Resource Measurement Facility to evaluate workload delay metrics such as CPU and I/O for both the application and z/OS Communications Server address space to determine if possible system resource constraints exist.

This situation is triggered when the average total response time is greater than .5 seconds.

As provided, this situation is not started automatically.

Note: Applicable only when monitoring TN3270 servers running on z/OS v1.8 and higher.

 

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