Patent ID: 7634618
Filing Date: 2009-12-15
Classification: G06F,Y10S

Abstract:
1. A method for optimized copying of logical units (LUNs) in a redundant array of inexpensive disks (RAID) environment using buffers that are smaller than delta map chunks, the method comprising: (a) providing a delta map including delta indicators for tracking locations of changes to data stored in a plurality of source and destination delta map chunks representing partitions of storage in physical disks of a redundant array of inexpensive disks (RAID) array, wherein each delta indicator corresponds to a delta map chunk and indicates whether data in the corresponding delta map chunk has changed, and wherein the delta indicator is updated when an application changes data in the corresponding delta map chunk; (b) providing a first buffer of a buffer size smaller than a delta map chunk size; and (c) sequentially copying an amount of data to fill the first buffer beginning at an address in the delta map chunk corresponding to a first change indicated by a delta indicator in the delta map.