| 摘要 |
PURPOSE:To improve the reliability of a system by disconnecting a cache memory to which abnormality occurs or updating its contents when abnormality occurs to the cache memory or one of disk controllers. CONSTITUTION:The disk controller 1 or 2 which detects the abnormality of the cache memory 3 by a cache memory abnormality detection part sends out a disconnection indication signal to the cache memory 3. Consequently, the cache memory 3 resets a ready-to-use state flag to inhibit access from the other disk controller to the cache memory 3. Further, after the disk controller 1 or 2 to which the abnormality occurs recovers, the disk controller checks three state display flags of the cache memory 3 and a self-diagnosis to the cache memory 3 is not taken when a connection state flag is not set and when the ready-to-use state flag is set. |
