Specifying whether the dump class is required or optional
Using REQUIRED for a dump class ensures that dump class will be dumped to. Copy pools with dump classes that are defined with FASTREPLICATIONDUMP(REQUIRED) must have all REQUIRED dump classes successfully completed in order for the dump version to be considered successful. If an attempt to delete or roll off the DASD version of which a REQUIRED dump class has not been completed, the command fails. You can complete an incomplete dump copy by using the FRBACKUP DUMPONLY function to retry the volumes that failed. To force a new DASD copy to be created to replace the existing copy, specify the FORCE keyword on the FRBACKUP command. Using the FORCE keyword prevents an incomplete dump copy from being completed.
A copy pool dump class defined as FASTREPLICATION(OPTIONAL) indicates
that the DASD used for the version can be overwritten to create a
new DASD version, even if the dump copy has not been completed successfully.
The FORCE keyword does not need to be specified on the FRBACKUP command.
Note: The FASTREPLICATIONDUMP options are incompatible
with the RESET option, any attempt to define a dump class with RESET
and FASTREPLICATIONDUMP options fails.