Methods, systems, and computer program products for optimized copying of logical units (LUNs) in a redundant array of inexpensive disks (RAID) environment using buffers that are smaller than LUN delta map chunks

摘要

Disclosed are methods, systems, and computer program products 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. According to one method, a delta map is provided including delta indicators for tracking locations of changes to data stored in a plurality of source delta map chunks representing partitions of storage in physical disks of a redundant array of inexpensive disks (RAID) array. A first buffer of a buffer size smaller than a delta map chunk size is provided. An amount of data is sequentially copied 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.