Joined: 14 Mar 2007 Posts: 8629 Location: Back in jolly old England
Yes, use IDCAMS to delete migrated datasets rather than anything else that causes a recall.
When IDCAMS deletes the catalog entry and sees that the dataset is migrated, it further signals to HSM to delete the MCDS D record which removes the entry from HSM.
The tape is not always made "FREE" by deleting a single dataset as HSM stores many datasets onto one tape volume. Until the tape is recycled by HSM it will not be made available to the scratch pool, well not unless some fool does a DELVOL PURGE on the volume