The DASD buffer volumes contain the cache linear data sets (LDSs) into which the application data is written by CA Vtape. These LDSs can be predefined, initialized, and added to CA Vtape with batch jobs and reused as needed or they can be dynamically defined and deleted by CA Vtape as needed. The predefined and reused-as-needed LDSs are known as static cache or static LDSs. The dynamically defined and deleted LDSs are known as dynamic cache or dynamic LDSs.
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