Overhead-free in-place recovery and repair schemes of XOR-based regenerating codes

In this paper, refined recovery and repair schemes are proposed for a storage system using the XOR-based MBR regenerating storage code proposed by Hou et al. Our schemes have zero transmission overhead for both recovery and repair, i.e., the total number of transmitted bits for repair/recovery is exactly equal to the total number of bits repaired/recovered. Further, our schemes use mainly XOR operations and have lower complexity than that of the previous schemes. Moreover, our schemes require only a small amount of auxiliary space, which qualifies our schemes as in-place.