gtpd1m3hDatabase Reference

User Modification Considerations

This section provides information to help you determine the CF list structure size for CF locking and considerations for when you change the lock name.

Determining the Coupling Facility List Structure Size for Locking

The size of the CF list structure you will use for locking is specific to your CF locking configuration. See your IBM service representative for guidance when determining the size of the CF list structure for locking.

Do the following if you need to change the size of the CF list structures you are using for locking:

  1. Enter the ZCFLK DELETE command to remove the CF from the CF locking configuration. The lock residency for all CF locks stored on this CF is recalculated automatically among the remaining CFs in the CF locking configuration on a module-by-module basis. As a result, CF locks can no longer be stored on this CF.
  2. Enter the ZCFLK ADD command with a new value specified for the SIZE parameter to add the CF to the CF locking configuration, which then enables the CF for use as an XLF so new locks can be stored on it.

See TPF Operations for more information about these commands.

Changing the Lock Name

If you change the lock name, you must provide a routine in the CFL1 copy member at CFL1VALK to prevent errors from occurring.

Changing the Name of Your Complex

If you change the name of your complex and then perform an initial program load (IPL) of the TPF system, you must ensure that all CF list structures for locking have been deleted and added again.