Institute of Electrical & Electronic Engineers
The RAID6 architecture is playing an increasingly important role in modern storage systems due to its provision of very high reliability. However, its high write penalty, because of the double-parity-update overheads upon each write operation, has been a persistent performance bottleneck of the RAID6 systems. In this paper, the authors propose a log-assisted RAID6 architecture, called RAID6L, to boost the write performance of the RAID6 systems. RAID6L integrates a log disk into the traditional RAID6 architecture, and alleviates its write penalty by simplifying the processing steps to service a write request.