Patent ID: 7334101
Filing Date: 2008-02-19
Classification: G06F,Y10S

Abstract:
1. A computer system, comprising: a primary storage system located at a primary site; a secondary storage system located at a first remote site from the primary site; and a ternary storage system located at a second remote site from the primary site; wherein the primary storage system is configured to transmit data from a first volume in a primary storage system to a back-up volume provided in the secondary storage system; wherein the primary storage system is configured to copy the data from the first volume in the primary storage system to a second volume in the primary storage system using a point in time (PiT) as a reference point of time for the copying, the second volume being provided with a first time consistent image of the first volume with respect to the reference point of time; wherein the primary storage system is configured to transfer the data from the second volume in the primary storage system to a third volume in the ternary storage system, the third volume being provided with a second time consistent image of the second volume, which is substantially the same as the first time consistent image; and wherein the ternary storage system is configured to copy the data from the third volume in the ternary storage system to a fourth volume in the ternary storage system, the fourth volume being provided with a third time consistent image corresponding to the second time consistent image, the third time consistent image being substantially the same as the first time consistent image.