Patent ID: 8190817
Filing Date: 2012-05-29
Classification: G06F

Abstract:
1. A RAID control apparatus which receives and processes an I/O request from a host before completing the writing of a RAID format pattern to a plurality of physical disk drives, comprising: a channel adapter for controlling interface with the host; a control unit which, when an I/O request arrives from the host and a range requested by the I/O request has not been RAID-formatted, executes a one-point format processing to write the RAID format pattern in an area of the physical disk drive that corresponds to the range requested by the I/O request, and a sequential format processing to write the RAID format pattern sequentially from a first logical block address to a last logical block address in a RAID configuration constituted by the plurality of physical disk drives; and a device adapter which is connected to the plurality of physical disk drives and controls interface with the plurality of physical disk drives, wherein the control unit executes the sequential format processing by setting a RAID format writing size of one cycle of the sequential format processing to be larger than the RAID format writing size of the one-point format processing.