Shutting down an IMS network for ISC

Use the IMS /CHECKPOINT command to terminate the network and shut down IMS.

The format of the /CHECKPOINT command determines whether the network termination occurs immediately or waits for processing to complete:

  • /CHECKPOINT FREEZE|DUMPQ|PURGE immediately terminates the session for all logical units, as follows:
    FREEZE
    Immediately after current input/output message
    DUMPQ
    After control blocks are past checkpoints
    PURGE
    After all queues are empty
  • /CHECKPOINT FREEZE|DUMPQ|PURGE QUIESCE allows all network nodes to complete normal processing before shutting down.

The IMS command /STOP DC also shuts down an IMS network at completion of processing.

Also, certain VTAM® commands, such as VTAM HALT NET, shut down the network.