Installing IMS service in an IMSplex

The following considerations apply when planning to install service into an IMSplex:

• Multiple Resource Managers (RMs) and Operations Managers (OMs) can run simultaneously in an IMSplex.

  If all your IMS systems on one LPAR, one OM must be running at all times to provide OM services.

• Only one Structured Call Interface (SCI) can run at any given time in an IMSplex on a single logical partition (LPAR).
• All Common Queue Server (CQS) clients connected to a CQS address space must be stopped before shutting down that CQS.

• For continuous availability, do not install service to the entire IMSplex at the same time.
• If you are running multiple IMS systems on one logical partition (LPAR), treat each IMS system within the IMSplex as a separate system, bringing each down individually, implementing service, testing it, and bringing it back online. After each system has successfully been brought back online, rotate to the next system, repeating the process.

  Apply service to less complex IMS systems before applying service to more complex IMS systems.

• If you are running multiple LPARs, install service on one LPAR at a time.

  Apply service to less complex LPARs before applying service to more complex LPARs.

• If your IMSplex includes IMS Connect, ensure that all appropriate IMS systems are available before starting IMS Connect. Otherwise, IMS Connect issues a datastore unavailable message.