Restart after an IMS failure

Restart an IMS subsystem in a data sharing environment in the same way as in a non-data sharing environment.

• If you can shut IMS down normally (a checkpoint shutdown using the /CHECKPOINT PURGE, /CHECKPOINT DUMPQ, or /CHECKPOINT FREEZE commands), use the /NRESTART command to restart IMS normally.
• If the IMS failed, you must use the /ERESTART command to perform an emergency restart.

In a data-sharing environment, if the associated IRLM also stops or fails, you must first start IRLM before you start IMS in a block-level environment.

Related reading: See IMS Version 15 Operations and Automation for more information about restarting IMS after it fails.