| 摘要 |
PROBLEM TO BE SOLVED: To surely device a fault of a hard disk drive(HDD), etc., even when information (defective flag F) that the HDD is broken down is at an indefinite state (not determined whether it is 0 or 1) in a battery backup memory(BBM) and to prevent useless restoring work, etc., of the HDD. SOLUTION: In this controller to control plural HDDs to store the same piece of data, the BBM to store the defective flags F (F1, F2) and access history of each HDD and the defective flags of the BBM are monitored, the access history of the HDD at an on state is taken out from the BBM when the defective flags are on (1), the defective flags of the HDD in the BBM are returned to off (0) when no history that the defective flags are turned on (1) exists by the access history and other HDD is activated when the history that the defective flags are turned on (1). exists.
|
