Software Rejuvenation for Higher Levels of VoIP Availability and Mean Time to Failure

2009 Fourth International Conference on Dependability of Computer Systems Pub Date : 2009-06-30 DOI:10.1109/DepCoS-RELCOMEX.2009.21

V. Koutras, Christoforos-Panagiotis S. Salagaras, A. Platis

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引用次数: 5

Abstract

Recently, Voice over Internet Protocol (VoIP) has become an evolutionary technology in the communication area. Despite its innovative nature, VoIP faces some problems such as resource degradation on the server supporting the system. In this paper a VoIP system consisting of the main parts that can affect the VoIP service such as SIP servers, routers, ISP internet service provider, firewalls and finally the electrical power is studied. To counteract the aforementioned problems concerning servers we propose to adopt software rejuvenation. Rejuvenation is a proactive technique that can be periodically adopted to prevent software failures. Our main aim is to determine how VoIP availability and reliability can be affected by rejuvenation. Continuous Time Markov Chain (CTMC) is used to model system’s function while asymptotic availability and Mean Time To Failure (MTTF) when rejuvenation is performed are determined. Moreover we are interested on the optimal rejuvenation policy that improves system’s performance.

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软件复兴为更高水平的VoIP可用性和平均故障时间

近年来，VoIP (Voice over Internet Protocol)技术已成为通信领域的一种新兴技术。尽管VoIP具有创新性，但也面临着支持系统的服务器资源退化等问题。本文主要研究了SIP服务器、路由器、ISP网络服务提供商、防火墙以及电源等影响VoIP业务的主要部件组成的VoIP系统。针对上述服务器方面的问题，我们建议采用软件复兴的方法。恢复是一种主动技术，可以定期采用以防止软件故障。我们的主要目的是确定VoIP的可用性和可靠性如何受到复兴的影响。采用连续时间马尔可夫链(CTMC)对系统的功能进行建模，确定了恢复时的渐近可用性和平均故障时间(MTTF)。此外，我们对改善系统性能的最佳再生策略感兴趣。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 Fourth International Conference on Dependability of Computer Systems

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