The following are general steps to follow when a rebuild hang occurs:

1. Look for and respond to any messages that indicate problems with rebuild. For example, IXL040E may be issued to identify a response that a connector has not provided.
2. To determine the state of the rebuild process, issue the following command: DISPLAY XCF,STRUCTURE,STRNAME=strname

   The rebuild hang might be the result of a problem with one or more connections associated with the structure. For connections that have not completed the rebuild process, check the status of the system, subsystem, or address space where the connector resides and try to correct the problem. See Identify the connector or systems that require recovery actions for more information.

3. Collect documentation as follows:
   • Take an SDUMP of the connections that are hanging, the XCF address space, and all data spaces owned by each address space to be dumped. For additional SDATA parameters, information about the couple data set dump utility, IPCS and trace parameters. See z/OS MVS Diagnosis: Reference.
   • Dump the CFRM and sysplex couple data sets.
4. Try to recover from the failure.

   Stop the rebuild with the SETXCF STOP,REBUILD,STRNAME=strname system command. Or stop the duplexing rebuild with theSETXCF STOP,REBUILD,DUPLEX,STRNAME=strname,KEEP=OLD system command. Determine if the rebuild stopped using the DISPLAY XCF,STRUCTURE,STRNAME=strname system command. If the structure is still in a rebuild process, collect documentation as indicated in step 3.

5. If the rebuild process was stopped, attempt to rebuild the structure again.
6. If the structure has failed-persistent connections, you might need to clean up the connections before you can rebuild the structure.
7. If a connector problem exists and cannot be resolved, consider terminating the connector that is not providing a response. Terminating a connector might involve shutting down the subsystem associated with the connector, cancelling the connector address space, or varying the connector system out of the Parallel Sysplex®.
8. When you have resolved the problem with the connector, attempt to rebuild the structure again.
9. With the information collected in step 3, diagnose and correct the cause of the hang.