For tapes created on a non-CA 1 system and used as input under CA 1, the Key Tape Procedure allows control with minimal manual effort. To implement this procedure, determine the number of tapes which are needed during a certain period. When the TMSCLEAN program is executed, indicate the number of tapes that should be logged out-of-area to the individual locations. (Tapes can be selected based on 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 the tapes are written on by the non-CA 1 system, 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 later used as input under CA 1, the TMC is automatically updated to contain the new data set name and expiration date. If EXPDT or RETPD is specified in the JCL, it is used. If is is not used, the system default KEYTAP parameter is used.
The default value of the KEYTAP parameter protects the tape for seven days from the date the tape was last used. 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.
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