Patent ID: 8074106
Filing Date: 2011-12-06
Classification: G06F

Abstract:
1. A storage control device for controlling the input and output of data from and to a plurality of storage devices, comprising: a new RAID group that is generated by adding at least one or more new storage devices to a plurality of old storage devices making up an old RAID group; a cache memory that is a volatile memory; a flash memory that is a non-volatile memory; a conversion part for performing a conversion process for converting data in an old RAID configuration read from said old RAID group into data in a new RAID configuration corresponding to said new RAID group to store the converted data in said old storage devices and said new storage device making up said new RAID group, and storing, in said cache memory, an initial address of a plurality of first areas storing data that is not yet converted into data in said new RAID configuration and a last address in a plurality of second areas storing data that has converted into data in said new RAID configuration; and an address management part for copying said initial address and said last address from said cache memory to said flash memory when a newest last address in said cache memory is matched with said initial address stored in said flash memory; wherein said conversion part resumes said conversion process from a predetermined point in time based on said initial address and said last address stored in said flash memory if a failure is detected.