Immediate duplication of I/O requests on a record by record basi

Details Immediate duplication of I/O requests on a record by record basi Immediate duplication of I/O requests on a record by record basi

1990-08-24

1991-12-10

Shaw, Gareth D.

Boots, shoes, and leggings

364268, 3642685, 364 265, 364285, 364280, 364DIG1, G06F 1216, G06F 1300

Patent

active

050723685

ABSTRACT:
A method for ensuring data integrity in a computer system having a primary logical device and one or more alternate logical devices. These logical devices have substantially identical data stored in them and have the capability of responding to requests. The system duplicates device access to the alternate logical devices. The logical devices are identified to the computer system as the devices on which duplicating or mirroring operations are to be performed. A read operation or a write operation is performed on the primary logical device. In the case of a write operation, it is also performed simultaneously on the alternate logical devices. The system waits for a response from the primary logical device. If the response indicates that the primary logical device has failed, the alternate logical devices are relied on to complete the operation.

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IBM Technical Disclosure Bulletin, vol. 26, No. 11, pp. 5792-5793, Apr. 1984.

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