Method for duplicating data of storage subsystem and data duplicating system
First Claim
1. A storage subsystem, wherein a storage subsystem belongs to a storage subsystem group comprising a plurality of storage subsystems and said storage subsystem being provided with a first means of writing data received from outside to the storage device of the storage subsystem, a second means of transmitting said data being given a serial number and a time to other storage subsystems, a third means of arranging a plurality of data received from other storage subsystems in sequence of said serial numbers, and a fourth means of deciding the oldest time among the kinds of latest time given to each of the storage subsystems by communicating at least some of the latest times between at least two storage subsystems for comparison, wherein the storage subsystem operates the first means and the second means when said storage subsystem is in local mode, and decides the data given with the time not later than the decided oldest time as the object of writing data by the first means operating the third means, the fourth means, and the first means at the remote mode.
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Abstract
In order to realize asynchronous type system assuring the consistency of data with the function of disk subsystems without the need of introducing new software to a host unit and without the deterioration of the performance of a main center, in a remote copy system which copies the data to the disk subsystems of the remote center for duplicating the data in the disk subsystems of the main center, the disk subsystems give serial numbers and times to the data together with writing said data to the storage devices in the disk subsystem and transfer said data to the other disk subsystems, and the other disk subsystems arrange the two or more data in the sequence of the serial numbers, decide the oldest time among the latest time given to each of the disk subsystems communicating among the disk subsystems and the data given with the time not later than the decided oldest time are the objects of writing to each of the disk storage devices.
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Citations
7 Claims
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1. A storage subsystem, wherein a storage subsystem belongs to a storage subsystem group comprising a plurality of storage subsystems and said storage subsystem being provided with
a first means of writing data received from outside to the storage device of the storage subsystem, a second means of transmitting said data being given a serial number and a time to other storage subsystems, a third means of arranging a plurality of data received from other storage subsystems in sequence of said serial numbers, and a fourth means of deciding the oldest time among the kinds of latest time given to each of the storage subsystems by communicating at least some of the latest times between at least two storage subsystems for comparison, wherein the storage subsystem operates the first means and the second means when said storage subsystem is in local mode, and decides the data given with the time not later than the decided oldest time as the object of writing data by the first means operating the third means, the fourth means, and the first means at the remote mode.
Specification