Tape seeding is an SMTape functionality that helps you initialize the destination storage system in a volume SnapMirror relationship.
Tape seeding enables you to establish a SnapMirror relationship between a storage system and a destination system over a low-bandwidth connection. Incremental mirroring of Snapshot copies from the source to the destination is feasible over a low bandwidth connection. However, an initial mirroring of the base Snapshot copy would take a long time over a low-bandwidth connection. In such a case, you can perform an SMTape backup of the source volume to a tape and use the tape to transfer the initial base Snapshot copy to the destination. You can then set up incremental SnapMirror updates to the destination system using the low-bandwidth connection.