z/OS Diagnostic Data Collection and Analysis

7. Cancelling tasks and taking dumps

Cancelling a problem task can be initiated from either an MVS console or from an SDSF session running under TSO provided sufficient security privileges have been set up. The MVS console has the highest dispatching priority, which allows commands to be issued at a sufficient level to handle most system loop or hang conditions. An IPL will be required if the problem task cannot be terminated using these procedures. Attempting to cancel a looping task via an SDSF session executing under TSO will often fail because the TSO session will have an insufficient dispatching priority to interrupt the loop process, but this is dependant on the severity of the looping process.

This chapter describes the following:

• Cancelling ...