Redundant path control apparatus and redundant path control method
AssigneeNEC Corporation
InventorKenichi Miki
Life of this patent
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Abstract
A host computer is connected to logical disks via controllers, and accesses the logical disks. When maintenance work is performed on a first controller, information indicating that the first controller is undergoing maintenance work is stored in the other controllers. When an access is made to a logical disk designating a path including the first controller, a redundancy driver of the host computer can discriminate the cause for an access failure based on the information stored in the other controllers even if the access fails.
Claims6
A redundant path control system comprising:
- a host computer;
- and
- a plurality of controllers connected to said host computer and an external memory device and mediates accesses of said host computer to said memory device through communication with said host computer,
- routes from said host computer to said controllers forming a plurality of paths different from one another,
- wherein each of said controllers acquires status information indicative of a status of a path including other controllers, stores said status information, and supplies said host computer with said status information in response to a request sent from said host computer, and
- said host computer designates one of said plurality of paths based on said status information and accesses said memory device via said designated path,
- wherein said status information includes information indicating a controller targeted for maintenance work.
A redundant path control method for allowing a host computer to select a path to be used for an access to an external memory device in a system comprising said host computer, and a plurality of controllers connected to said host computer and said external memory device and mediates accesses of said host computer to said memory device through communication with said host computer, routes from said host computer to said controllers forming a plurality of paths different from one another,
- wherein each of said controllers acquires status information indicative of a status of a path including other controllers, stores said status information, and supplies said host computer with said status information in response to a request sent from said host computer, and
- said host computer designates one of said plurality of paths based on said status information and accesses said memory device via said designated path,
- wherein said status information includes information indicating a controller targeted for maintenance work.
Dependencies are inferred from the claim text.