【摘要】 对软件的两阶段失效与恢复模型进行了分析,基于特定失效概率求解最优恢复时间间隔,并利用半马尔可夫过程,得到特定失效概率下的平均恢复成本。为了将恢复成本降到更低,采用了嵌套的基于时间的软件恢复策略,同时考虑应用级和系统级的恢复,并求得了特定失效概率下的最大应用级恢复次数、恢复时间间隔序列以及最低年平均恢复成本。更多还原

【Abstract】 A method solving the rejuvenation intervals based on a given failure probability is put forward in this paper.The two-step failure model with rejuvenation interval and semi-Markov process are used for solving the mean rejuvenation cost based on the given-failure-probability.In addition,considering fine-grained rejuvenation consumes lower cost and less downtime,this paper adopts the nested time-based software rejuvenation policy,which takes the application-level and system-level rejuvenation into account simultaneously.And then based on the given-failure-probability,it obtains the maximum times of application-level rejuvenation,the rejuvenation interval sequence,and the minimum mean rejuvenation cost.更多还原