Data set Exists on Primary (MC). This optional field can be defined 1 to 13, or blank. The default is 2. When this field is defined with a number, the number indicates the maximum number of backup versions to keep for a data set. When this field is defined as blank, an unlimited number of backup versions will be kept. For more information, review the sysparm description for DSNDUPVL in the Systems Guide.
Note: The setting of sysparm DSNDUPVL can affect all of the SMS fields that pertain to Backup. This sysparm controls whether or not multiple backup copies of the data set from different volumes are counted as the same data set. It is recommended that this sysparm be set to 'Y' in DFSMS environments. This is because of volume pooling and the fact that SMS does not allow uncataloged copies. If this sysparm is left set to 'N', the same data set name from another volume will start over on the copy count for SMS managed copy count checks. Potentially, this can dramatically increase the number of backup copies kept in IXMAINT.
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