Patent ID: 7152183
Filing Date: 2006-12-19
Classification: G06F

Abstract:
1. In a system having a primary storage volume having first data stored thereon and a secondary storage volume having second data stored thereon, the primary storage volume coupled to the secondary storage volume by a communications link, a method of restoring data after a suspension of the link, the method comprising: upon suspension of the link, maintaining a first image of the first data stored on the primary volume and maintaining a second image of second data stored on the secondary volume; tracking updates to the first data and updates to the second data after suspension of the link; revising the maintained first image of the first data stored on the primary volume to account for the updates to thereby provide a complete first data image for use when the link is restored; revising the maintained second image of the second data stored on the secondary volume to account for the updates to thereby provide a complete second data image for use when the link is restored; and based on the complete first data image and the complete second data image, copying data between the primary volume and the secondary volume when the link is restored to thereby resynchronize the primary volume and the secondary volume.