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Normal data set retention periods are based on criteria defined by parameter DO RETENTION (see the description of parameter DO RETENTION in this chapter). However, alternate retention criteria can be used if an abend (or system crash) occurs. These alternate (abend) retention criteria are specified by parameter DO ABENDRET. As with normal retention periods, if the abend retention period has passed, the data set can be overwritten – even if the data set is located on a non-scratch volume.
When a data set is opened, Control-M/Tape scans the rules to determine abend retention expiration dates. If an abend occurs before the normal close of the data set, the current generation of the data set is the expiration date specified in a DO ABENDRET statement.
When a data set is closed normally, Control-M/Tape scans the rules to determine normal retention expiration dates.
For additional information on retention periods, see Retention Management.
If a DO RETENTION statement and a DO ABENDRET statement are included in a rule definition and both these statements specify the CYCLES retention type, the value for subparameter PREFIX in these statements must be identical. The setting for subparameter PREFIX however, does not have to match the setting for this subparameter in a DO VAULT statement specifying the CYCLES retention type.
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