Patent ID: 8145860

Claim:
A method for comparing data units, the method comprising: generating a first digest representing a first data unit stored in a first memory, by a first processor associated with the first memory; deriving a first encoded value based, at least in part, on the first digest and a predetermined value, by the first processor; generating a second digest representing a second data unit stored in a second memory different from the first memory, by a second processor different from the first processor, the second processor being associated with the second memory; deriving a second encoded value based, at least in part, on the second digest and the predetermined value, by the second processor; determining whether the first data unit and the second data unit are the same based, at least in part, on the first digest, the first predetermined value, the first encoded value, and the second digest, by first processor; and if the second data unit is not the same as the first data unit, storing the first data unit in the second memory, by the second processor.