| 摘要 |
PROBLEM TO BE SOLVED: To use sub-volume at an asynchronous remote copying destination.SOLUTION: When the virtual tape of the main storage system 20P is updated, journal data are created. The journal data are transmitted to a DR (Disaster Recovery) storage system 20S asynchronously with the timing at which the write data are received from a computer 10P in a main site 1P. The journal data includes a marker to notify of the start of updating and a marker to notify of the completion of updating. The DR storage system 20S prohibits the use of the copy destination data during the period from start of updating until completion of updating, and permits referencing the copy destination data during other periods. |
