| 摘要 |
PURPOSE:To shorten the operating time with a single file and to improve the reliability by releasing the area of a faulty file at the time of the occurrence of trouble and reserving an area having the same capacity on another disk and automatically copying by a normal file with respect to original and duplicate dual files. CONSTITUTION:If an input/output error occurs in an original 4 or a duplicate 5 of dual files, a file restoring means 3 releases the area of the file where trouble occurs, by a file area release processing 31, and sets the trouble position to an unusable state to prevent this position from being used again. An area having the same capacity, attribute, etc., as the faulty file is reserved by a file are area reservation processing 32 based on the information registered in a dual file management table 1 from a magnetic disk device having an idle area 6 for restoration. The write access to the normal file is inhibited by a file access inhibition processing 33, and file contents of the normal file are copied to the file reserved for restoration by a file copy processing 34.
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