Performance consequences of parity placement in disk arraysThe performance of a variety of parity placement schemes are defined and investigated to demonstrate that, at relatively large request sizes of hundreds of kilobytes, the choice of parity placement significantly affects performance (20 to 30 percent for the disk array configurations that are common today). It is shown that the left-symmetric, extended-left-symmetric and flat-left-symmetric are the best RAID level 5 parity placements. The placement with the highest read performance, flat-left-symmetric, has the lowest write performance, while the placement with the lowest read performance, left-symmetric, has the highest write performance. Suggestions for optimizing parity placements are included.
Document ID
19910060601
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lee, Edward K. (California Univ. Berkeley, CA, United States)
Katz, Randy H. (California, University Berkeley, United States)