Method and apparatus for efficient remote copy

A computer-readable storage medium storing a plurality of instructions for controlling a data processor for remote copy from a primary storage system to a secondary storage system having a plurality of storage devices, the plurality of instructions comprising:

• instructions that cause the data processor to manage a secondary volume, of a remote copy pair with a primary volume of the primary storage system, and corresponding to a portion of the plurality of storage devices, the secondary volume having a function for storing data included in journal data sent from the primary storage system according to a remote copy procedure;
• and
• instructions that cause the data processor to handle the journal data to be stored temporarily in a third volume corresponding to another portion of the plurality of storage devices of the secondary storage system before storing the data of the journal data to the secondary volume, if a relationship between the journal data and another journal data, which has smaller sequence number than sequence number of the journal data and is sent from the primary storage system to the secondary storage system, has a condition.