For tapes which are created on a non-CA 1 system and used as input under CA 1, the Key Tape procedure allows control with minimal manual effort. Tapes that are expired, are not in a vault (no slot number) and are marked out-of-area are eligible for Key Tape Processing.
To implement the Key Tape procedure, you must determine the number of tapes which are needed during a certain period (daily, weekly, and so on). When the TMSCLEAN program is executed, indicate how many scratch tapes are to be logged out-of-area to the individual locations (tapes can be selected based on VOLSER, density or label type).
As the tapes go scratch, they are automatically logged out-of-area. The scratch tapes can then be placed in an area close to the non-CA 1 system. After they are written on, they are filed in the tape library. Protection is maintained because CA 1 does not allow these scratch tapes to be used for output as long as they are marked out-of-area.
When the tape is subsequently used as input under CA 1, the TMC is automatically updated to contain the new data set name and an expiration date. If an EXPDT or RETPD is specified in the JCL, it is used; if not, the value of CA 1 system option KEYTAP is used to protect the tape for the retention period that you specified.
All other pertinent TMC fields are updated, and the out-of-area code is removed. CA 1 then has complete control of the tape for tracking, reporting, and protection purposes.
The Key Tape Procedure is not intended to be used with tapes managed using the Distributed Tape Support feature.
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