A Construction of Systematic MDS Codes with Minimum Repair Bandwidth

Abstract

In a distributed storage system based on erasure coding, an important problem is the \emph{repair problem}: If a node storing a coded piece fails, in order to maintain the same level of reliability, we need to create a new encoded piece and store it at a new node. This paper presents a construction of systematic $(n,k)$-MDS codes for $2k\le n$ that achieves the minimum repair bandwidth when repairing from $k+1$ nodes.Comment: Submitted to IEEE Transactions on Information Theory on August 14, 200