Storage control device and storage device error control method

A storage device error control method for use in cases where a specified error occurs in a plurality of storage devices that provide a redundant storage region constructed using parity data to an upper device, said method comprising the steps of:

• judging whether or not a preset specified timing has arrived;
• detecting whether or not said specified error has occurred in any of said respective storage devices in cases where it is judged that said specified timing has arrived;
• and
• in cases where said specified error is detected, executing specified processing related to said specified error for at least a unit storage region within a specified range contiguous to an error unit storage region in which said specified error is detected among a plurality of unit storage regions belonging to the storage device in which said specified error is detected.

A storage control device which is respectively connected to an upper device and a plurality of storage devices, comprising:

• an upper communications part for performing communications with said upper device;
• a lower communications part for performing communications with each of said respective storage devices;
• a control part which constructs a redundant storage region that uses parity data by means of said respective storage devices, and which inputs and outputs data into and from said redundant storage region via said lower communications part on the basis of instructions from said upper device received via said upper communications part;
• and
• a memory used by this control part;
• wherein said control part respectively executes the steps of:
• judging whether or not a read request for data has been issued by said upper device;
• successively reading out data from the respective blocks of the storage device that stores the requested data in cases where said read request has been issued by said upper device, and respectively storing this data in said memory;
• detecting any error block in which said data could not be normally read out among said respective blocks;
• respectively recovering the data stored in the respective blocks located from said error block to the block corresponding to the tail end of a read-out range designated by said read request, this recovery being accomplished on the basis of other data and parity data respectively relating to these sets of data, and storing these respective sets of recovered data in said memory;
• when all of the data contained in said read-out range has been stored in said memory, transferring these sets of data to said upper device;
• respectively producing new parity data on the basis of the respective sets of recovered data relating to respective specified blocks located from the block positioned immediately after said error block to the block corresponding to the tail end of said read-out range;
• judging whether or not the respective sets of old parity data already stored in memory for the data stored in said respective specified blocks and said respective sets of new parity data that are newly produced coincide;
• and
• closing the storage device that has said error block in cases where even one combination of said respective sets of old parity data and said respective sets of new parity data does not coincide.