Patent ID: 7529887

Claim:
A method for postponing bitmap transfers and eliminating configuration information transfers during trespass operations in a disk array environment, the method comprising: (a) storing, on a disk array, a clone group including a logical unit (LUN) representing a storage partition on the disk array and a clone of the LUN, the clone being a copy of the data referenced by the LUN at a point in time; (b) associating the clone group with a first storage processor (SP) for writing data to the disk array; (c) tracking changes between the LUN and the clone by maintaining a first data structure indicative of the changes in a memory associated with the first SP; (d) changing the association of the clone group to a second SP for writing data to the disk array without transferring the first data structure to memory associated with the second SP; and (e) after the changing of the association of the clone group to the second SP: calculating, at the second SP and using clone state information stored in the memory associated with the second SP that was transferred from the first SP independently of the change in the association, an indicator that indicates whether a forward synchronization or a reverse synchronization is required between the clone and the LUN, and, in response to determining to perform a forward or a reverse synchronization, transferring the first data structure to the memory associated with the second SP and performing the forward or reverse synchronization at the second SP using the first data structure.