Patent
1992-12-17
1996-11-19
Lee, Thomas C.
39520012, 395427, 395555, 395601, 395849, 395855, 395878, G06F 1300
Patent
active
055772226
ABSTRACT:
A system for asynchronously duplexing direct access storage device (DASD) data in a plurality of DASD subsystems has the advantage of decoupling the data duplexing operation from the DASD write I/O operation. This ensures the write does not incur unnecessary wait states in the subsystem. By establishing a sequence checkpoint at which time a set of information packets are grouped together and processed as a single sequence unit, this decoupling and independent operation takes place. Through this independence, data copying to a secondary location can take place without affecting the performance of the subsystems and also not affecting the corresponding integrity of the data that is being updated.
REFERENCES:
patent: 4020466 (1977-04-01), Cordi et al.
patent: 4159517 (1979-06-01), Paradine et al.
patent: 4503499 (1985-03-01), Mason et al.
patent: 4507751 (1985-03-01), Gawlick et al.
patent: 4814971 (1989-03-01), Thatte
patent: 4916605 (1990-04-01), Beardsley et al.
patent: 5148540 (1992-09-01), Beardsley et al.
patent: 5155845 (1992-10-01), Beal et al.
patent: 5170480 (1992-12-01), Mohan et al.
patent: 5321832 (1994-06-01), Tanaka et al.
Micka William F.
Mikkelsen Claus W.
Shomler Robert W.
Huang Po C.
International Business Machines - Corporation
Lee Thomas C.
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