Apparatus, method and program for the control of storage

A storage control method writing plural pieces of user data into (n-1) storage devices of n storage devices and writing parity data calculated from the plural pieces of user data into remaining one (1) storage device, the storage control method comprising:

• a failure monitoring step of issuing an instruction to re-create parity depending on the degree of detected abnormality for each of the storage devices;
• and
• a parity re-creation step, when receiving the instruction to re-create parity from the failure monitoring step, of reading the plural pieces of user data from the (n-1) storage devices to re-calculate parity data for write into the remaining one (1) storage device.

A program operable to drive a computer of a storage control apparatus writing plural pieces of user data into (n-1) storage devices of n storage devices and writing parity data calculated from the plural pieces of user data into remaining one (1) storage device to execute:

• a failure monitoring step of adding points in proportion to detected abnormality to find statistically added points for each of the storage devices, and issuing an instruction to re-create parity when the statistically added points come closer to a predefined failure determination point;
• and
• a parity re-creation step, when receiving the instruction to re-create parity from the failure monitoring step, of reading the plural pieces of user data from the (n-1) storage devices to re-calculate parity data for write into the remaining one (1) storage device.