Patent ID: 6772304
Filing Date: 2004-08-03
Classification: G06F

Abstract:
In a data storage system having a first host device and a second host device, each host device having exclusive access, respectively, to a first storage device and a second storage device, a method for controlling the data storage system comprising:generating a first volume pair comprising a first determining volume in said first storage device and a second determining volume in said second storage device; generating a second volume pair comprising a primary volume in said first storage device and a secondary volume in said second storage device, wherein said primary volume and said secondary volume constitute a remote copy pair; detecting a communication event that occurs between said first and second host devices, and in response thereto: said first host device and said second host device each communicating a reserve command respectively to said first determining volume and to said second determining volume; said first host device communicating a first pair volume control command to said primary volume; and said second host device communicating a second pair volume control command to said secondary volume.