Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2007-04-24
2007-04-24
Ellis, Kevin L. (Department: 2188)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
Reexamination Certificate
active
10958597
ABSTRACT:
An electronic apparatus includes first and second processors which execute first and second operating systems, first disk controller which accesses a disk storage device in response to a disk access request from the first processor, a second disk controller which accesses the disk storage device in response to a disk access request from the second processor, a switch device to connect one of the first and second disk controllers to the disk storage device, and a unit for switching an access path, which is used when the first processor accesses the disk storage device, between a first access pass in which the first processor executes access to the disk storage device via the second processor, and a second access pass in which the first processor executes access to the disk storage device without intervention of the second processor.
REFERENCES:
patent: 5237670 (1993-08-01), Wakerly
patent: 2005/0080975 (2005-04-01), Elledge et al.
patent: 5-216802 (1993-08-01), None
patent: 11-250569 (1999-09-01), None
Ahmed Hamdy
Ellis Kevin L.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kabushiki Kaisha Toshiba
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