| 摘要 |
PURPOSE:To shorten a recovery time by restricting and detecting the range of data destructed by the influence of power failure generated during the updating of an external storage device so that the recovery processing can be efficiently executed. CONSTITUTION:Control information in output processing at the time of power failure is stored in a non-volatile storage part 4 in a CPU 1 so as to be outputted to respective external storage devices 8 in common. Thereby, the data part of the external storage device 8 whose data may be destructed can be restricted by an economical means, and when the data of the prescribed unit only in the restricted part are read out, whether the partial data are completely updated up to its end or not can be decided by the check information, so that the data destruction part can be economically and rapidly restricted. Consequently, the recovery processing time can be shortened and the reliability and operation efficiency of the system can be improved. |
