Method and arrangement for multi-system remote data duplexing an

Details Method and arrangement for multi-system remote data duplexing an Method and arrangement for multi-system remote data duplexing an

1993-03-23

1995-08-29

Beausoliel, Jr., Robert W.

Boots, shoes, and leggings

364DIG1, G06F 1134

Patent

active

054468710

ABSTRACT:
A method and system for asynchronous remote data duplexing at a distant location from copies based at a primary site storage subsystem, which copying is non-disruptive to executing applications, and further in which any data loss occasioned by losses in flight or updates never received at the time of any interruption between the primary and remote sites are accounted for at the remote site. The method assigns a token and unique sequence number responsive to each write operation at the primary site, and sends the tokens+numbers and data updates to the remote site. The method relies upon the sequence number to establish a sequency and define gaps therein to ascertain missing updates.

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U.S. Ser. No. 07/781,044 filed Oct. 19, 1991 "Method and Means for Time Zero Backup Copying of Data".

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