A CF lock structure might fail and need to be rebuilt if the CF lock structure named IGWLOCK00 does not exist, or if it is not connected to the system attempting to open a VSAM data set for record-level sharing. In either case, DFSMS internally initiates a rebuild queueing all applications using VSAM RLS during the rebuild process. The rebuild is transparent to these applications.

If both the CF lock structure and the system fail, all recoverable data sets which were open for VSAM RLS processing at the time of failure are converted to "lost locks". The data sets become unavailable to any processing besides recovery processing (such as backouts), and no new sharing is allowed until the recovery processing is complete. A new CF lock structure must be available to perform the recovery processing.

In this case, you can redefine or replace the CF lock structure, correct the problem causing its unavailability, or move the work requiring VSAM RLS to another system which has connectivity to an available CF lock structure.