评估人为错误对数据存储系统可用性的影响
Evaluating Impact of Human Errors on the Availability of Data Storage Systems
摘要：
在本文中，我们研究了不正确的磁盘更换服务的数据存储系统的可用性的影响。为此，我们首先进行蒙特卡罗模拟评估磁盘子系统的可用性，考虑磁盘故障和不正确的磁盘更换服务。我们还提出了一个马尔可夫模型，证实了蒙特卡洛模拟结果。我们进一步扩展所提出的模型，考虑自动磁盘故障转移政策的影响。由该模型得到的结果表明，忽略不正确的磁盘更换的影响可能会导致高达三个数量级的不可用性低估。此外，这项研究表明，通过考虑人为错误的影响，传统的认为不同的RAID机制的可靠性应该被修改。结果表明，在存在人为错误的情况下，与RAID5相比，RAID1可能导致较低的可用性。
英文摘要：
In this paper, we investigate the effect of incorrect disk replacement service on the availability of data storage systems. To this end, we first conduct Monte Carlo simulations to evaluate the availability of disk subsystem by considering disk failures and incorrect disk replacement service. We also propose a Markov model that corroborates the Monte Carlo simulation results. We further extend the proposed model to consider the effect of automatic disk fail-over policy. The results obtained by the proposed model show that overlooking the impact of incorrect disk replacement can result up to three orders of magnitude unavailability underestimation. Moreover, this study suggests that by considering the effect of human errors, the conventional believes about the dependability of different RAID mechanisms should be revised. The results show that in the presence of human errors, RAID1 can result in lower availability compared to RAID5.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
