| Summary: | 碩士 === 國立交通大學 === 資訊科學系所 === 93 === In recent years, Internet services have become more and more popular in our daily life. More and more commercial services are provided through Internet. According to previous research, a few minutes of downtime of a commercial Internet service will lead to a great loss of money for the company. Furthermore, system failures and system maintenance contribute to most of the service unavailability.
In order to keep Internet service running permanently, we provide a framework based on virtual machines to allow zero-loss service recovery and upgrade. The framework can detect system faults automatically and transparently recover the on-line requests. Moreover, it also allows on-line requests to be migrated to an upgraded system. We implemented the framework by modifying an open source virtual machine monitor, Xen, and the Linux kernel on top of Xen. According to the experimental results, the framework causes little overhead and has acceptable recovery time.
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