My impression is that HSM migrated the dataset from disk to tape and recataloged it to MIGRAT. HSM decided at some point to remove the entry where the dataset was on the tape. Why shouldn't HSM uncatalog it. He (DFHSM) is responsible for knowing where on a tape a dataset is not Tape Mgmt System. DFHSM.MIGRATE.xxxxxxx is how tape system knows tape files
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