讲座题目: A Horizontal-Diagonal Parity Code to Optimize I/O Load   

Balancing in RAID-6

时间：2011年7月4日（周一）上午10：30

地点：行政楼C座505报告厅

摘要： With higher reliability requirements in clusters and data centers, RAID-6 has gained popularity due to its capability to tolerate concurrent failures of any two disks, which has been shown to be of increasing importance in large scale storage systems.  Among various implementations of erasure codes in RAID-6, a typical set of codes known as Maximum Distance Separable (MDS) codes aim to offer data protection against disk failures with optimal storage efficiency. However, because of the limitation of horizontal parity or diagonal/anti-diagonal parities used in MDS codes, storage systems based on RAID-6 suffers from unbalanced I/O and thus low performance and reliability.

To address this issue, in this talk, we propose a new parity called Horizontal-Diagonal Parity (HDP), which takes advantages of both horizontal and diagonal/anti-diagonal parities. The corresponding MDS code, called HDP code, distributes parity elements uniformly in each strip to balance the I/O workloads. HDP also achieves high reliability via speeding up the recovery under single or double disk failure.  Our analysis shows that HDP provides balanced I/O and higher reliability compared to other popular MDS codes.

讲座教授简介：

Dr. Xubin He is currently an Associate Professor of Electrical and Computer Engineering at Virginia Commonwealth University. Dr. He received his PhD in Electrical and Computer Engineering from University of Rhode Island, USA in 2002 and both his MS and BS degrees in Computer Science from Huazhong University of Science and Technology, China, in 1997 and 1995, respectively.  Prior to join VCU, Dr. He was an associate professor (2007-2010) and assistant professor (2002-2007) at Tennessee Tech University (TTU). His research interests include computer architecture, reliable and high availability storage systems and distributed computing.

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