Patent ID: 8312315
Filing Date: 2012-11-13
Classification: G06F

Abstract:
1. A control method for storage control device including a plurality of first storage devices, the control method comprising: configuring a first RAID group on the plurality of first storage devices by a first RAID configuration; adding one or more second storage devices to the first RAID group to configure a second RAID group by a second RAID configuration; reading first data according to the first RAID configuration from first address of the first RAID group; converting the first data, which are stored according to the first RAID configuration, to second data by adding new parity data which are created according to the second RAID configuration, and converting the first address to second address according to the second RAID configuration; and storing the converted second data according to the second RAID configuration in the converted second address of the second RAID group comprising the plurality of first storage devices and the one or more second storage devices, wherein the second RAID group comprising the plurality of first storage devices and the one or more second storage devices are configured to include 1) a plurality of first areas storing data that are not converted data according to the second RAID configuration, 2) a plurality of second areas storing converted data according to the second RAID configuration and 3) a plurality of third areas storing data that are not converted data according to the second RAID configuration and are corresponding to the converted data, wherein the converted second data are stored in the third areas.