Electrical computers and digital data processing systems: input/ – Access polling
Reexamination Certificate
2005-02-01
2005-02-01
Rinehart, Mark H. (Department: 2111)
Electrical computers and digital data processing systems: input/
Access polling
C710S200000, C710S240000, C710S107000, C710S112000, C710S113000, C710S036000
Reexamination Certificate
active
06851005
ABSTRACT:
Apparatus and methods are provided for efficiently implementing logical-device reservations in a cluster computer system. The apparatus includes cooperating controllers programmed in firmware around a distributed reservation table. The apparatus manages access to a logical device, with first and second nodes with respective bus controllers communicatively coupled to each other and to a logical device by means of a bus. The first controller receives a request to reserve the logical device and, in response, communicates a reservation request for the logical device over the bus to the second controller for execution by the second controller. In response to the communicated reservation request, the second controller reserves the logical device for the first node.
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Gnanasivam Govindaraju
Surugucchi Krishnakumar Rao
Ananian R. Michael
Dorsey & Whitney LLP
International Business Machines - Corporation
King Justin
Rinehart Mark H.
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