Remote copy system

A remote copy system comprising a first storage system and a second storage system,

• wherein said first storage system including:
• a primary volume storing a write data sent from a computer;
• a primary journal volume storing journal data at least including said write data and updated time;
• and
• a first controller configured to transfer said journal data to said second storage system;
• wherein said second storage system including:
• a secondary journal volume storing said journal data transferred from said first storage system;
• a secondary volume to which said journal data stored in said secondary journal volume is restored;
• a replica volume;
• and
• a second controller configured to compare updated time included in journal data and a backup reservation time which indicates a reserved time to back up data stored in said secondary volume to said replica volume,
• wherein:
• if said second controller after said second controller restores one or more journal data including updated time before the backup reservation time from said secondary journal volume to said secondary volume, the second controller is configured to suspend restoration of journal data from said secondary journal volume to said secondary volume, and then change a copy status between said secondary volume and the replica volume from a split status to a resynchronize status, and
• when said second controller does not detect a journal data including updated time after the backup reservation time, the second controller is configured to back up data stored in said secondary volume to said replica volume.

A remote copy system comprising a first storage system and a second storage system,

• wherein said first storage system including:
• a primary volume storing a write data sent from a computer;
• a primary journal volume storing journal data at least including said write data and updated time;
• and
• a first controller configured to transfer said journal data to said second storage system;
• wherein said second storage system including:
• a secondary journal volume storing said journal data transferred from said first storage system;
• a secondary volume to which said journal data stored in said secondary journal volume is restored;
• a replica volume;
• and
• a second controller configured to compare updated time included in journal data and a backup reservation time which indicates reserved time to back up data stored in said secondary volume to said replica volume,
• wherein:
• when said second controller detects a journal data including updated time after the backup reservation time, the second controller is configured to suspend restoration of journal data from said secondary journal volume to said secondary volume, and start to copy data stored in said secondary volume to said replica volume, and
• when said second controller does not detect a journal data including updated time after the backup reservation time, the second controller is configured to start to copy data stored in said secondary volume to said replica volume.

A method for operating a remote copy system comprising a first storage system and a second storage system, said first storage system including a primary volume storing a write data sent from a computer, and a primary journal volume storing journal data at least including write data and updated time, said second storage system including a secondary journal volume, a secondary volume, and a replica volume, the method comprising:

• transferring said journal data from said first storage system to said second storage system;
• storing said journal data transferred from said first storage system in said secondary journal volume;
• restoring said journal data stored in said secondary journal volume to said secondary volume;
• comparing updated time included in journal data and a backup reservation time which indicates reserved time to back up data stored in said secondary volume to said replica volume;
• wherein:
• when a journal data including updated time after the backup reservation time is detected, suspending restoration of journal data from said secondary journal volume to said secondary volume, and then starting back up of data stored in said secondary volume to said replica volume, and
• when a journal data including updated time after the backup reservation time is not detected, backing up data stored in said secondary volume to said replica volume.