System for sharing storage device among controllers and...

Details System for sharing storage device among controllers and... System for sharing storage device among controllers and...

2006-09-12

2009-02-24

Bataille, Pierre-Michel (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

C711S203000, C711S170000

Reexamination Certificate

active

07496717

ABSTRACT:
The present invention discloses a system for sharing a storage device among controllers, which includes a first controller and a second controller connected with each other, and both connected to a storage device including a plurality of logical unit numbers. The controllers detect their respective logical unit numbers and define the respective logical unit number detected by an opposite party as a virtual logical unit number. The controllers separately have a resource allocation unit for specifying the logical unit numbers to perform data accesses for the controllers and define a virtual identification for each virtual logical unit number based on an identification number thereof. If the first controller accesses data in a logical unit number detected by the second controller and requests the second controller to perform a data access of the respective virtual logical unit number thereof based on the virtual identification number, the second controller will search for a matched virtual logical unit number to perform the data access and return the access result to the first controller.

REFERENCES:
patent: 7260656 (2007-08-01), Matsunami et al.
patent: 2004/0010662 (2004-01-01), Aruga

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