Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1998-04-01
2000-12-05
Yoo, Do Hyun
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
711162, G06F 1216
Patent
active
061579912
ABSTRACT:
In a computer system including a CPU, a first storage system coupled to the CPU, a second storage system, and a communication link coupling the second storage system to the first storage system, a method and apparatus for asynchronously mirroring, to the second storage system, a plurality of units of data written by the CPU to the first storage system. In one aspect of the invention, the CPU writes units of data to the first storage system in a first order, and the units of data are asynchronously transmitted over the communication link from the first storage system to the second storage system in a second order that is different than the first order. In another aspect, the units of data are committed in the second storage system in an order that is independent of the order in which the units of data are received at the second storage system. In a further aspect of the invention, a packet of information is transmitted over the communication link to the target storage system to specify a commitment order in which the units of data should be committed in the target storage system. In another aspect of the invention, a single copy of each of the units of data is written into the first storage device, without buffering a copy to support asynchronous mirroring. In a further aspect, the storage locations in the first storage system are organized into a plurality of consistency sets, and the units of data are asynchronously transmitted over the communication link so that each consistency set has a representation in the second storage system that is consistent with a valid representation of the consistency set in the first storage system at some point in time.
REFERENCES:
patent: 5379418 (1995-01-01), Shimazaki et al.
patent: 5504861 (1996-04-01), Crockett et al.
patent: 5544347 (1996-08-01), Yanai et al.
patent: 5870537 (1999-02-01), Kern et al.
PCT International Search Report for PCT/US99/06719 completed Jul. 30, 1999.
EMC Corporation
Encarnacion Yamir
Yoo Do Hyun
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