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How SnapMirror handles Snapshot copies for cascading destinations

SnapMirror retains on the original source volume the Snapshot copies needed for transfers to destinations further down the line. Snapshot copies that are still needed by a destination are labeled snapmirror in the output of the snap list command. SnapMirror deletes the Snapshot copies it no longer needs.

If you remove a destination from the cascade, you can use the snapmirror release command from the immediate source to tell SnapMirror to delete the Snapshot copies associated with that destination.