Failure in rebuilding a coupling facility

You can initiate a rebuild of the coupling facility by issuing the z/OS® SETXCF START,REBUILD command.

z/OS can also initiate a rebuild in response to:

• A coupling facility structure failure
• A connection failure if the active System Failure Management (SFM) policy threshold for rebuilding the coupling facility has been reached

If the rebuild fails, IMS stops data sharing. Transactions trying to access shared data terminate with a U3303 abend. If the rebuild failure was associated with an OSAM or VSAM structure, transactions accessing nonshared databases can still be processed. If the failure was associated with an IRLM structure, the IRLM disconnects from the data-sharing group.