The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2008
Filed:
Nov. 08, 2005
Shinichi Hiramatsu, Odawara, JP;
Isamu Kurokawa, Odawara, JP;
Hisaharu Takeuchi, Odawara, JP;
Jyunichi Muto, Odawara, JP;
Miyuki Yasuda, Odawara, JP;
Shinichi Hiramatsu, Odawara, JP;
Isamu Kurokawa, Odawara, JP;
Hisaharu Takeuchi, Odawara, JP;
Jyunichi Muto, Odawara, JP;
Miyuki Yasuda, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a data processing system in which a host processing apparatus and a storage subsystem are connected via a channel interface, the present invention makes it possible to expand the number of logical device addresses in excess of the device address limitations of the channel interface, and also enhances the performance of parallel access processing for the same logical device. When an access request is generated for a logical device, the host processing apparatus stores the logical device address to be accessed in a prefix command of a channel command word (CCW) for the access request, sets this CCW in a device information block of a frame which complies with the channel interface, sets a parallel access identifier for identifying a plurality of accesses for the same device in a device address of this frame, and then sends this frame to the storage subsystem.