In the event of a loss of connectivity to the coupling facility, coupling facility structure failure, or operator initiated rebuild command, the following message is issued on each system notified by global resource serialization of a rebuild in progress.

    
 ISG323A GLOBAL RESOURCE SERIALIZATION STOPPED ON sysname.
    LOCK STRUCTURE (ISGLOCK) REBUILD IS DUE TO reason.

   

While the global resource serialization lock structure is being rebuilt, no systems are allowed to join the star complex. If a system attempts to connect the complex during the rebuild, the following message is issued:

    
      ISG318I GRS INITIALIZATION IS SUSPENDED UNTIL LOCK    
              STRUCTURE (ISGLOCK) REBUILD IS COMPLETE. 
   

In the case of a structure or connectivity error, the first system in the complex to be notified will respond by automatically initiating a rebuild of the lock structure. XES will determine if a rebuild is warranted under the current policy. If so, global resource serialization will continue with the rebuild process. If not, the rebuild will be stopped and global resource serialization will attempt to return to and use the original lock structure. Any systems without connectivity to the original lock structure will be terminated with a X'0A3' wait state with reason code X'C8' or X'D0'. For either of the reason codes, the following message is issued:

    
      ISG309W GRS PROCESSING TERMINATED. UNRECOVERABLE FAILURE
              DURING LOCK STRUCTURE, REBUILD PROCESSING.
    

When a lock structure rebuild successfully completes, the following message is issued:

    
      ISG325I GRS LOCK STRUCTURE (ISGLOCK) REBUILD HAS
              COMPLETED ON sysname.