Patent ID: 6324655
Filing Date: 2001-11-27
Classification: G06F

Abstract:
An array storage system coupled to a host unit and comprising:logical devices, each logical device comprising:a spare storage device, anddata storage devices;array-type disk controllers, provided in a pair and in parallel and coupled to the logical devices and to the host unit, each of said array-type controllers simultaneously and independently controlling a respective one of said logical devices to execute a command issued by the host unit and to determine whether each of the spare storage device and the data storage devices provided in the respective one of said logical devices is one of normal and abnormal, each of said array-type disk controllers controlling said data storage devices provided in the respective one of said logical devices if the each of said data storage devices provided in the respective one of said logical devices is normal, and controlling the spare storage device and remaining of said normal data storage devices provided in the respective one of said logical devices if one of the data storage devices provided in the respective one of the logical devices is abnormal; andpower supply means for supplying power to each of said data storage devices and said spare storage device and for maintaining each of said data storage devices and said spare storage device provided in each of said logical devices in ready status, wherein the spare storage device stores data previously stored in the one of the data storage devices being abnormal, and reconstructed by a reconstruction process, and wherein data is not stored in the spare storage device if said data storage devices are normal.