Recovery of data using write request copies in delta queue

Details Recovery of data using write request copies in delta queue Recovery of data using write request copies in delta queue

2005-08-16

2005-08-16

Nguyen, Hiep T. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C714S006130

Reexamination Certificate

active

06931502

ABSTRACT:
Recovering mirrored data after the failure of a computer using write requests stored in a delta queue of an associated computer without transmitting all of the mirrored data. A write request at a primary computer is stored in a delay buffer. A copy of the write request is transmitted to a backup computer and stored in a delta queue. The backup computer executes the copy of the write request and transmits acknowledgement of the receipt of the write request to the primary computer. In response to the acknowledgement, the primary computer executes the write request stored in the delay buffer. The computers then exchange subsequent acknowledgements of the write request execution, enabling the computers to delete the write requests. If the primary computer fails, the primary computer recovers data by receiving only the copies of write requests that remain stored in the delta queue of the backup computer.

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