Haim Levendel

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In order to reduce system outages and the associated downtime cost caused by the “software aging” phenomenon, we propose to use software rejuvenation as a proactive system maintenance technique deployed in a CMTS (Cable Modem Termination System) cluster system. Different rejuvenation policies are studied from the perspective of implementation and(More)
In this paper, we propose a high availability design of a Cable Modem Termination System (CMTS) clusters system based on the software rejuvenation technique. This proactive system maintenance technique is aimed to reduce system outages and the associated downtime cost due to the ‘software aging’ phenomenon. Different rejuvenation policies are studied from(More)
Conclusions In this paper, we investigate the availability requirement for the fault management server in high-availability communication systems. According to our study, we find that the availability of the fault management server does not need to be 99.999% in order to guarantee a 99.999% system availability as long as the fail-safe ratio (the probability(More)
The desire to use commercial, off-the-shelf (COTS) components is prevalent throughout industry, the DoD, and NASA. The potential benefits of using COTS are many, including reduced development time for systems and the availability and maturity of many commercial tools and operating systems. However, use of COTS products is also fraught with pitfalls and(More)
Prioritized recovery can provide differentiated recovery services to the users in communication networks. This paper studies the transient behavior of communication networks under prioritized recovery. Stochastic Petri net models are constructed to capture the behaviors of a queueing system at four different phases during the recovery process, i.e.(More)
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