DISK ARRAY DEVICE

摘要

PROBLEM TO BE SOLVED: To solve a problem that an I/O processing function is remarkably lowered when a writing request to cause misalign is made. SOLUTION: An Alignment judging processing part 23 judges whether or not a writing processing of data is Alignment by a logical address to indicate a starting position of writing of the received data and data size. When the Alignment judging processing part 23 judges the processing as Misalign, an Alignment state is set by supplementing invalid data so that the data size of the data becomes integer multiples of a parity calculation block when the data size is not the integer multiples of the parity calculation block by an invalid data supplement processing part 24 and converting the logical address so that the logical address coincides with offset when the logical address does not coincide with the offset of the parity calculation block by an address conversion/ address management processing part 25.