Abstract: This paper presents a transient analysis of software rejuvenation with virtualization. In particular, we apply the phase-type expansion to analyze the pointwise availability of virtual-machine (VM) based software rejuvenation with two policies; cold-VM and warm-VM rejuvenation policies. The performance measures can be derived from the stochastic models described by labeled Markov rege...

With the growth of Internet, “always on” services are becoming increasingly important. Software rejuvenation is a well-known proactive technique to prevent failures due to software aging and extend the lifetime of longrunning software such as Internet Servers, billing systems, telecommunication switches [1]. However, doing a machine reboot to rejuvenate takes time in the order of minutes and ca...

Software rejuvenation is a preventive maintenance technique that has been extensively studied in recent literature. In this paper, we extend the classical result by Huang et al. (1995), and in addition propose a modified stochastic model to generate the software rejuvenation schedule. More precisely, the software rejuvenation models are formulated via the semi-Markov reward process, and the opt...

In this paper, we extend the classical result by Huang, Kintala, Kolettis and Fulton (1995), and in addition propose a modified stochastic model to determine the software rejuvenation schedule. More precisely, the software rejuvenation models are formulated via the semi-Markov processes, and the optimal software rejuvenation schedules which maximize the system availabilities are derived analyti...

Background: With the increase in life expectancy, middle aged and elderly people comprise a substantial percentage of the population worldwide. Since aging often manifests itself in the human skin, skin rejuvenation methods have gained a lot of popularity. Current medical modalities such as botulinum toxininjection, fillers, and laser therapy can provide symptomatic relief of skin aging s...

Software rejuvenation is a preventive maintenance technique that has been extensively studied in the recent literature. In this paper, we extend the classical result by Huang, Kintala, Kolettis and Fulton (1995), and in addition propose a modified stochastic model to generate the software rejuvenation schedule. More precisely, the software rejuvenation models are formulated via the semi-Markov ...

objectives this study aimed to evaluate the efficacy of afcl in improvement of hand photoaging in 25 patients. patients and methods a prospective, before- after, single blind study was conducted in 25 patients who presented for desired treatment of hand photoaging. patients received three treatments sessions with afcl. results all enrolled patients were female and received three treatment sessi...

Recently, a complementary approach to handle transient software failures, called software rejuvenation, is becoming popular as a proactive fault management technique in operational software systems. In this study, we develop the optimal scheduling algorithms to trigger software rejuvenation in distributed computation circumstance. In particular, we focus on two different computation circumstanc...

Software failures are now known to be a dominant source of system outages. Several studies and much anecdotal evidence point to “software aging” as a common phenomenon, in which the state of a software system degrades with time. Exhaustion of system resources, data corruption, and numerical error accumulation are the primary symptoms of this degradation, which may eventually lead to performance...

Complex business service systems, such as SOA system, are prone to suffer from reliability problem. Various legend applications compatible in SOA system make things worse. Software rejuvenation would be a proactive approach against it. However, an apt time point for rejuvenation is left as an open challenge, both due to the dynamics of system workload and due to obscurity about the problems’ ca...