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Scratch Pool Enforcement

When Scratch Pool Management is enabled, CA 1 provides enforcement for both pool and nonpool nonspecific output requests. If a data set to be created requires the use of a specific pool, but the volume mounted to satisfy the request is not part of the assigned ranges, CA 1 demounts the volume. CA 1 issues an IECTMS3 NOT SCRATCH message (code 80). The request is reissued.

If the request is not for a specific pool, but a volume is mounted that is assigned to a specific pool, CA 1 dismounts the volume and issues the IECTMS3 NOT SCRATCH message (code 84). The request is reissued.

If you have changed the scratch sub-pool rules and you are trying to MOD onto a tape, CA 1 continues to enforce using the same sub-pool as the first tape when requesting the mount of another tape.