Method and apparatus for data duplexing in storage unit system
AssigneeHitachi, Ltd.
InventorsTooru Suzuki, Katsunori Nakamura, Teruo Nagasawa, Takahisa Kimura, Takeshi Koide
Life of this patent
Estimating the term…
Abstract
With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.
Claims20
A storage system, comprising:
- a plurality of storage units configured to store data;
- a first control unit configured to control data written by a second control unit, the first control unit including:
- a channel adaptor configured to receive data written by the second control unit;
- a disk adaptor configured to transfer data to the plurality of storage units and receive data from the plurality of storage units;
- and
- a memory configured to store data and/or information received from the channel adaptor and the disk adaptor;
- and
- a communication cable that connects the first control unit and a third control unit,
- wherein the first control unit is configured to communicate management information with the third control unit via the communication cable, and wherein based on the management information the first control unit and the third control unit are configured to determine common management information that describes a relationship between a plurality of data stored in the first control unit and in the third control unit, and to store data, which is selected based on the common management information, and which is from said memory, in the plurality of storage units.
A storage system, comprising:
- a plurality of storage units configured to store data;
- a first control unit configured to control data transferred by a plurality of control units, the first control unit including:
- a channel adaptor configured to receive data transferred by the plurality of control units;
- a disk adaptor configured to transfer data to the plurality of storage units and to receive data from the plurality of storage units, and
- a memory configured to store data or information received from the channel adaptor and the disk adaptor;
- and
- a communication cable that connects the first control unit and a second control unit,
- wherein the first control unit is configured to communicate management information with the second control unit via the communication cable, and wherein based on the management information the first control unit and the second control unit are configured to determine common management information relating a plurality of data stored in the first control unit and the second control unit.
Dependencies are inferred from the claim text.