Use the External Data Manager (EDM) feature to manage tapes for products such as CA Disk or IBM DFSMShsm that maintain their own catalog of tape files and volumes.
Business Value:
The EDM feature gives an additional level of protection against tape volumes from being erroneously expired before the controlling application is finished with the tape.
Additional Considerations:
The following list shows the most common products that are supported by the EDM feature:
Within the CA 1 TMC, the tapes from these products will look like they are single file and single volume. In reality, they will have multiple files on each tape. They will be kept with an EXPDT of PERMANENT. The EDM must notify CA 1 when each tape should be expired and scratched by calling an exit, ARCTVEXT. This exit is distributed with CA 1 and is always present when the CA 1 CTAPLINK library is part of the linklist.
EDM rules are set up in the CTAPOPTN library in the member TMOEDMxx. The rules must contain the EDMid. The DSN, DD, JOB, and PGM names are optional, but you must specify at least one name.
If you are specifying the program name in the rule (using the PGM= parameter), you may need to write multiple rules. If the program that creates the tape and the program that releases the tape are different, you need to have at least two rules. The EDMid must be the same for all of the rules for that product.
Note: For more information about the setup of the EDM rules, see the Programming Guide and the Installation Guide.
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