Storage device controller

A storage controller for outputting an I/O request to a storage device in reply to a data I/O request in file units from an information processing device, comprising:

• a logical volume accessible by said information processing device and configured in said storage device;
• a channel controller having a controller for receiving said data I/O request in file units and generating a sequential I/O, and a plurality of I/O processors for outputting said sequential I/O request to said storage device in reply to a command from said controller, wherein said controller includes in said command the cumulative total of the block address size in said logical volume to which said sequential I/O from the commencement of said sequential I/O request is output;
• and
• a memory for storing control information for said controller to control said I/O processor;
• wherein a plurality of stripe units are formed by striping said logical volume into a stripe size of an arbitrary storage capacity, and information regarding which I/O processor among said plurality of I/O processors will output said I/O request to which stripe unit among said plurality of stripe units is stored as said control information in said memory.