Shutting down an IMSplex

If you are running IMS as an IMSplex with CSL, and you are shutting down the entire IMSplex, you should stop the CSL manager address spaces (ODBM, OM, RM, and SCI) after you shut down the IMS control region.

If you are planning to restart the IMS control region, you do not need to stop the CSL address spaces. The new IMS control region will connect to the existing CSL address spaces when it initializes.

The following briefly summarizes shutting down the IMSplex:

Procedure

  1. Shut down the IMSplex components that participate in that IMSplex by issuing a /CHE FREEZE or similar command to the individual IMS components.
  2. Shut down CSL by using one of the following methods:
    • A z/OS® MODIFY command
    • A z/OS STOP command for each component
    • A CSLZSHUT request to an SCI in the IMSplex
  3. Shut down CQS by issuing a z/OS MODIFY command.

If automatic export to the IMSRSC repository during IMS shutdown fails, IMS is not allowed to shut down. A DFS4391E message is issued to indicate that IMS cannot shut down because automatic export failed. The error must be resolved and shutdown reissued so that automatic export can complete and IMS can shut down. Or, you can issue the UPDATE IMS command to set AUTOEXPORT(N) and retry the shutdown to allow IMS to shut down. If you need to cold start IMS when automatic export has not been done, see the procedures for retrieving the resources to be exported from the IMS log by using the Create RDDS from Log Records utility (DFSURCL0) and the EXPORTNEEDED parameter.