CA 1 allows tapes that it controls to be used, and managed by external systems. EDM supports this process for systems such as DFSMShsm. CA 1 options define which products are EDMs and which data sets are to be treated as EDM controlled. CA 1 supports multiple EDMs.
When the correct criteria is presented during OPEN processing, CA 1 sets a status indicator designating EDM control and records the EDMID. The tape is not eligible for scratch processing until the EDM informs CA 1 that it has released the tape for scratch. CA 1 system option REDM can be used by the EDM to specify extended retention criteria for tapes released from EDM control. In addition, a facility is provided to define a scratch pool for each EDM.
CA 1 does not create DSNBs or chain multivolume data sets for tapes that are EDM controlled; each tape is treated as a single volume, single file data set. An exit is available to define the criteria that determines which tapes are to be treated as EDM controlled. However, the ability to assign multiple EDMIDs through the selection criteria in the TMOEDMxx member of CAI.CTAPOPTN minimizes the need for this exit.
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