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Starting and terminating Xchange

This section describes how to start and terminate Xchange. It also explains how to enable Xchange Enhanced STCK, STCKE, and STCKF Support.

Xchange consists of three separate entities:

  • Subsystem (long-running address space)
  • ISPF interface
  • Replacements for the IBM-supplied TIME services.

The subsystem must be active whenever any Xchange processing occurs. Any number of Xchange subsystems can be active in a single MVS complex at the same time, but each must have a unique subsystem name. We recommend, however, that only one subsystem be active at a time.

You can start the Xchange subsystem either by submitting it as a normal batch job, or by initiating it from the operator console as a started task. We recommend running Xchange as a started task or a high priority batch job in order to avoid any negative impact from higher priority systems or jobs. Terminate Xchange with the SHUTDOWN command, as described in Terminating-Xchange. We recommend that you not use the MVS CANCEL command to terminate Xchange.

Tip

After you start Xchange, you then need to invoke it, as described in Using-Xchange.

This section contains the following topics:

 

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