Structure dumps are associated with a physical structure instance. If a structure dump exists for a structure, and then the structure is rebuilt or duplexed, the structure dump remains associated with the old (primary) structure only and is not copied as part of the system-managed processing. When the rebuild completes or should a switch occur, the system will keep the old (primary) instance because of the associated structure dump. When the structure dump either is written out to a dump data set or is explicitly forced, the old (primary) instance will be deallocated.

For system-managed rebuild, if the dump serialization interferes with coupling facility operations generated by the system when the system is allocating the new structure, connecting users to it, or performing other system processing in support of the rebuild, the system will stop the rebuild. However, if dump serialization is held during the copying of the structure data from the old to the new structure, system-managed rebuild will continue.

For system-managed duplexing rebuild, structure dumping is allowed during any phase of system-managed duplexing rebuild. However, during the Allocate and Attach phases, the system cannot tolerate structure dump serialization and the system-managed duplexing rebuild process will be stopped.