A method for facsimile transmission over a packet network includes establishing a facsimile call between first and second facsimile terminals in accordance with a facsimile protocol, using a facsimile gateway to convey communications between the terminals over the packet network. The device comprises a gear having grooves that open inwardly toward the axis and extend axially. The first storage system is configured to store write data in the first data volume upon receiving a write request from a first host associated with the first storage system and generate a journal including control data and journal data A second storage system includes a journal volume and configured to receive and store the journal generated by the first storage system in the journal volume.