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Remote copying system with consistency guaranteed between a pair

  • US 20060161721A1
  • Filed: 02/02/2006
  • Published: 07/20/2006
  • Est. Priority Date: 04/23/2004
  • Status: Active Grant
First Claim
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1. A method for controlling a remote copy system, wherein the remote copy system includes:

  • a first system coupled to a host computer, wherein the first system includes a plurality of first logical disks, to which data is written from the host computer with keeping consistency of the data;

    a second system coupled to the first system, wherein the second system includes a plurality of second logical disks, wherein a plurality of synchronous type remote copy pairs, each of which includes one of the plurality of first logical disks and one of the plurality of second logical disks, are configured, and wherein data transmitted from the first system to the second system is written in the plurality of second logical disks with keeping consistency of the data, and a third system coupled to the first system, wherein the third system includes a plurality of third logical disks, wherein a plurality of asynchronous type remote copy pairs, each of which includes one of the plurality of first logical disks and one of the plurality of third logical disks, are configured, and wherein data transmitted from the first system to the third system is written in the plurality of third logical disks with keeping consistency of the data, wherein a synchronous copy group including the plurality of synchronous type remote copy pairs and an asynchronous copy group including the plurality of asynchronous type remote copy pairs are configured, the method comprising steps of;

    receiving a report related to a failure of a remote copy process regarding to a first logical disk;

    obtaining information to specify a copy group including a remote copy pair including the first logical disk related to the failure; and

    deciding whether the synchronous copy group or the asynchronous copy group includes the remote copy pair including the first logical disk related to the failure, in order to suspend remote copy processes for a plurality of remote copy pairs included in the decided copy group with keeping consistency of data of a plurality of logical disks included in the plurality of remote copy pairs.

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