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 larger than LUN delta map chunks
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United States of America Patent
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Dec 15, 2009
Grant Date -
Jul 5, 2007
app pub date -
Jan 3, 2006
filing date -
Jan 3, 2006
priority date (Note) -
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Abstract
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 larger 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 larger 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.
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