Delta RAID to Enhance Recovery and Small-Write Performance of RAID Storages

초록

This paper proposes a novel Delta redundant array of independent disks (RAID) technique that enhances small-write performance and resists disk failures of up to 75% in the RAID architecture. In order to generate parity data, three partial strips within a horizontal strip are used. To generate one parity element, Delta RAID requires access from two data disks and one parity disk. Delta RAID provides a fast recovery algorithm to correct various disk failures. Delta RAID also employs additional buffer caching replacement (BCR), which reduces the number of read and write operations by both merging small chunks into a larger chunk with buffer size and splitting a big chunk into many smaller chunks with buffer size. Compared to traditional GRID RAID(SPC, STAR), GRID RAID(SPC, EO), and GRID RAID(STAR, STAR), Delta RAID improves average small-write performance by 233%, 224%, and 176%, respectively, improves read performance by 289%, 268%, and 176%, respectively.