Patent ID: 7039662
Filing Date: 2006-05-02
Classification: G06F,Y10S

Abstract:
1. A storage system having a first storage subsystem and a second storage subsystem coupled to a host computer via a network, wherein, the first storage subsystem includes: the second storage subsystem includes: wherein data in the first storage volume are copied to a third storage volume of the storage volumes in the second storage subsystem and a third retention information corresponding to the first retention information is stored in the setting information storage area of the second storage subsystem according to a request for copying the data in the first storage volume so that write access to the third storage volume is prohibited based on the third retention information after the data stored in the first storage volume are copied to the third storage volume; wherein data in the second storage volume are copied to a fourth storage volume of the storage volumes in the second storage subsystem and a fourth retention information corresponding to the second retention information is stored in the setting information storage area of the second storage subsystem according to a request for copying the data in the second storage volume so that write access to the fourth storage volume is prohibited based on the fourth retention information after the data stored in the second storage volume are copied to the fourth storage volume; and wherein the third retention information take over remaining days in the first retention information, the remaining days indicating the number of days for which write access to a storage volume is prohibited.