Use the REJOIN option in GRSCNFxx to indicate whether or not a system that has been temporarily stopped can automatically rejoin the ring when the system resumes processing. A system that stops temporarily causes a ring disruption; the ring is rebuilt without the stopped system. REJOIN(YES) allows the system to automatically rejoin the ring when it resumes processing; no operator intervention is required. REJOIN(NO) means that the operator must bring the system back into the ring when the system resumes processing.

IBM® recommends that you always specify REJOIN(YES) to avoid the problems of operator intervention and operator delay during recovery. REJOIN(YES) does not cause any potential ring processing problems or data integrity exposures. When the automatic rejoin does not succeed, global resource serialization issues messages, and the operator can then intervene to bring the system back into the ring. In general, the automatic rejoin succeeds when there is at least one active system in the ring and an available link between the active system and the rejoining system.