Further protection is provided with the use of the CA 1 Scratch Pool Management feature, which allows you to restrict nonspecific output access to tape pools of CA 1 controlled volume ranges. This feature is not supported for the IBM 3494, 3494/VTs and 3495, SMS managed tape. If any tape is mounted from outside a requested scratch pool range, the tape is demounted and the request is reissued. Similarly, if a tape from a defined pool is mounted for a non-pool request, the volume is demounted and the mount request reissued.
Assignment of volumes to tape pools and definition of access rules is accomplished in the TMOSCRxx and TMONSMxx members of CAI.CTAPOPTN. An exit is provided for customization of processing. If you have changed the scratch subpool rules and are trying to MOD onto a tape, CA 1 continues to enforce using the same subpool as the first tape when requesting the mount of another tape.
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