A Response Time Distribution Model for Zoned RAID

Abstract. RAID systems are widely deployed, both as standalone storage solutions and as the building blocks of modern virtualised storage platforms. An accurate model of RAID system performance is therefore critical to understanding storage system performance. To this end, this paper presents a queueing network-based model of RAID systems comprised of zoned disks and operating at RAID level 0-1 or 5. The contribution over previous work is twofold. Firstly, our analysis approximates full I/O request response time distributions rather than just mean values. This provides the ability to reason about response time quantiles and higher moments of response time

• Type: Conference
• Year: 2008
• Where: ASMTA
• Authors: Abigail S. Lebrecht, Nicholas J. Dingle, William J. Knottenbelt
• Keywords: ASMTA 2008, Mathematics, RAID, RAID Systems, Response Time