| 摘要 |
PURPOSE:To prevent a backup data file from the generation of data lack completely at its formation by forming a means for requesting data transfer from a backup device to a primary station and a means for transferring the requested data from the primary station to the backup device. CONSTITUTION:Usually, data is inputted to the primary station 10 as shown by the arrow 14 and also to the backup device 11 which always monitors a circuit. When the data is not inputted to the primary station 10, the primary station 10 executes recovery processing and requests retransfer of the data to a secondary station 12. Thereby, the backup device 11 is prevented from the failure of data input. However, the backup device 11 may fails in data input in spite of the data input to the primary station 10. In this case, the transfer of the data failed to be inputted is requested to the primary station 10 at the reception of boring from the primary station to the backup device 11. Then, the primary station 10 transfers the data to the backup device 11. |
