关键词：高效节能；可靠性模型；并行磁盘系统；磁盘交换策略
摘 要：This chapter presents a reliability model to quantitatively study the reliability of energy-efficient parallel disk systems equipped with the MAID technique. Note that MAID is a well-known effective energy saving schemes for parallel disk systems. It aims to skew I/O load toward a few disks so that the other disks can be transitioned to low power states to conserve energy. I/O load skewing techniques such as MAID inherently affect reliability of parallel disks because disks storing popular data tend to have high failure rates than disks storing cold data. To address the reliability issue in MAID, we developed single disk swapping strategies to improve disk reliability by alternating disks storing hot data with disks holding cold data. In addition, we introduced multiple disk swapping scheme to further improve reliability of MAID. Then, we quantitatively evaluated the impacts of the disk swapping strategies on reliability of MAID-based disk systems.