Patent ID: 6754727
Filing Date: 2004-06-22
Classification: G06F

Abstract:
A data processing system comprising a host processing device, and a storage control device connected to said host processing device via a communication means and storing data sent from said host processing device, wherein:said host processing device and said storage control device specify, upon an I/O processing of data in respect to an actual storage region of said storage control device, said actual storage region which becomes a target of said processing by a logic device corresponding to said actual storage region; said host processing device comprises a plurality of control blocks processing an I/O request in respect to said storage control device, and comprises a means which, in a case an I/O request in respect to a certain base device occurs, makes a base control block corresponding to said base device conduct a processing in respect to said I/O request, whereas, if said base control block is in use, makes an alias control block of an alias device assigned to said base device conduct said processing; said storage control device comprises a deciding means for deciding, upon processing an I/O request in respect to a certain base device, whether or not there is a need to newly assign an alias device to said base device according to a situation of one or a plurality of component elements within said storage control device; and a means for notifying said host processing device via said communication means to the effect that assigning is decided as necessary according to said decision; and said host processing device comprises a means for recognizing that an alias device is newly assigned to said base device when there is said notification from said storage control device.