Independent Row-Oblique Parity for Double Disk Failure Correction
Chih‐Shing Tau · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2006
This paper proposes a parity placement scheme, Row-Oblique Parity (ROP), for protecting against double disk failure in disk array systems. It stores all data unencoded, and uses only exclusive-or (XOR) operations to compute parity. ROP is provably optimal in computational complexity, both during construction and reconstruction. It is optimal in the capacity of redundant information stored and accessed. The simplicity of ROP allowed us to implement it within the current available RAID framework.