As just explained, CA Disk defaults to using dynamic allocation for the archive data sets. For tape and 3480 devices, however, you can override dynamic allocation by supplying the needed information on the appropriate DD statements in the JCL. CA Disk creates the data set name from the DSNAME you provide in the JCL unless you omitted it completely or specified a temporary name (DSN=&&anyname). In both of these cases, CA Disk uses the appropriate sysparm (ARC0NAME, ARCCNAME, MERPnNAME, MERCnNAME, or MERTnNAM) to create the data set name.
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