Dealing with waits

When investigating what appears to be a problem with tasks or subsystems waiting, it is necessary to take into account the environment in which the task or subsystem is running.

It might be that your z/OS system is generally under stress. In this case, there will be many symptoms. If there is not enough real storage, jobs will experience waits at paging interrupts or swap-outs. Input/output (I/O) contention or high channel usage can also cause waits.

We can use standard monitoring tools, such as Resource Monitoring Facility (RMF) to diagnose such problems. Use normal z/OS tuning techniques to resolve them.