How a system event affects a cluster

Certain commands that end system functions, such as Power Down System (PWRDWNSYS), End System (ENDSYS), and End Subsystem (ENDSBS) commands may end a cluster abruptly, causing a cluster partition to occur.

In V5R4, enhancements have been made to the PWRDWNSYS, ENDSYS, and ENDSBS commands. If clustering is active on the node when these commands are executed, an End Cluster Node (QcstEndClusterNode) API will be issued.

If you want these commands to complete, you should use OPTION(*CNTRLD) and specify the appropriate delay time in the DELAY parameter. Otherwise, the End Cluster Node API may not have completed before control is returned to the end system function.

Note: If the user specifies OPTION(*IMMED), the End Cluster Node (QcstEndClusterNode) API has about 30 seconds to complete before the system ends. This may result in a failover instead of a end cluster node.